Exhibit 4.34

THIS WARRANT AND THE SHARES OF COMMON STOCK ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE SECURITIES ACT) OR ANY STATE SECURITIES LAWS AND MAY NOT BE SOLD,
TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS REGISTERED UNDER THE SECURITIES ACT AND UNDER APPLICABLE STATE SECURITIES LAWS OR FIBERNET TELECOM GROUP, INC. SHALL HAVE RECEIVED AN OPINION OF ITS COUNSEL THAT REGISTRATION OF SUCH SECURITIES UNDER THE
SECURITIES ACT AND UNDER THE PROVISIONS OF APPLICABLE STATE SECURITIES LAWS IS NOT REQUIRED.

WARRANT TO PURCHASE

SHARES OF COMMON STOCK

OF

FIBERNET TELECOM GROUP, INC.

Expires
September 30, 2009



|                                 |  |                              
|-------------------------------- |  | -----------------------------
|No.: W-06- __                    |  | Number of Shares: ___________
|Date of Issuance: March 22, 2006 |  |                              

FOR VALUE RECEIVED, subject to the provisions hereinafter set forth, the undersigned, FiberNet
Telecom Group, Inc., a Delaware corporation (together with its successors and assigns, the Issuer), hereby certifies that ___________________________ or its registered assigns is entitled to subscribe for and purchase, during the
Term (as hereinafter defined), up to ____________________________________
() shares (subject to adjustment as hereinafter
provided) of the duly authorized, validly issued, fully paid and non-assessable Common Stock of the Issuer, at an exercise price per share equal to the Warrant Price then in effect, subject, however, to the provisions and upon the terms and
conditions hereinafter set forth. Capitalized terms used in this Warrant and not otherwise defined herein shall have the respective meanings specified in Section 9 hereof.

1. Term. The term of this Warrant shall commence on March 22, 2006 and shall expire at 5:00 p.m., eastern time, on September 30, 2009
(such period being the Term).

2. Method of Exercise; Payment; Issuance of New Warrant; Transfer and Exchange.

(a) Time of Exercise. The purchase rights represented by this Warrant may be exercised in whole or in part during the Term
commencing on September 30, 2006 and expiring on September 30, 2009.

(b) Method of Exercise. The Holder hereof may
exercise this Warrant, in whole or in part, by the surrender of this Warrant (with the exercise form attached hereto duly executed) at the principal office of the Issuer, and by the payment to the Issuer of an amount of consideration



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therefor equal to the Warrant Price in effect on the date of such exercise multiplied by the number of shares of Warrant Stock with respect to which this
Warrant is then being exercised, payable at such Holders election (i) by certified or official bank check or by wire transfer to an account designated by the Issuer, (ii) by cashless exercise in accordance with the
provisions of subsection (c) of this Section 2, but only when a registration statement under the Securities Act providing for the resale of the Warrant Stock is not then in effect, or (iii) by a combination of the foregoing methods of
payment selected by the Holder of this Warrant.

(c) Cashless Exercise. Notwithstanding any provisions herein to the contrary and
commencing one (1) year following the Original Issue Date, if (i) the Per Share Market Value of one share of Common Stock is greater than the Warrant Price (at the date of calculation as set forth below) and (ii) a registration
statement under the Securities Act providing for the resale of the Warrant Stock is not then in effect, in lieu of exercising this Warrant by payment of cash, the Holder may exercise this Warrant by a cashless exercise and shall receive the number
of shares of Common Stock equal to an amount (as determined below) by surrender of this Warrant at the principal office of the Issuer together with the properly endorsed Notice of Exercise in which event the Issuer shall issue to the Holder a number
of shares of Common Stock computed using the following formula:



|      |  |     |  |                                                                                                                                                                                           |  |        |  | 
|----- |  | --- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------ |  | 
|      |  | X = |  | Y -                                                                                                                                                                                       |  | (A)(Y) |  | 
|      |  |     |  |                                                                                                                                                                                           |  | B      |  | 
|      |  |     |  |                                                                                                                                                                                           |  |        |  | 
|Where |  | X = |  | the number of shares of Common Stock to be issued to the Holder.                                                                                                                         
|      |  |    
|      |  | Y = |  | the number of shares of Common Stock purchasable upon exercise of all of the Warrant or, if only a portion of the Warrant is being exercised, the portion of the Warrant being
exercised.
|      |  |    
|      |  | A = |  | the Warrant Price.                                                                                                                                                                       
|      |  |    
|      |  | B = |  | the Per Share Market Value of one share of Common Stock.                                                                                                                                 

(d) Issuance of Stock Certificates. In the event of any exercise of the rights represented
by this Warrant in accordance with and subject to the terms and conditions hereof, (i) certificates for the shares of Warrant Stock so purchased shall be dated the date of such exercise and delivered to the Holder hereof within a reasonable
time, not exceeding three (3) Trading Days after such exercise (the Delivery Date) or, at the request of the Holder (provided that a registration statement under the Securities Act providing for the resale of the Warrant
Stock is then in effect), issued and delivered to the Depository Trust Company (DTC) account on the Holders behalf via the Deposit Withdrawal Agent Commission System (DWAC) within a reasonable time, not
exceeding three (3) Trading Days after such exercise, and the Holder hereof shall be deemed for all purposes to be the holder of the shares of Warrant Stock so purchased as of the date of such exercise and (ii) unless this Warrant has
expired, a new Warrant representing the number of shares of Warrant Stock, if any, with respect to which this Warrant shall not then have been exercised (less any amount thereof which shall have been canceled in payment or partial payment of the
Warrant Price as hereinabove provided) shall also be issued to the Holder hereof at the Issuers expense within such time.



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(e) Compensation for Buy-In on Failure to Timely Deliver Certificates Upon Exercise. In addition
to any other rights available to the Holder, if the Issuer fails to cause its transfer agent to transmit to the Holder a certificate or certificates representing the Warrant Stock pursuant to an exercise on or before the Delivery Date, and if after
such date the Holder is required by its broker to purchase (in an open market transaction or otherwise) shares of Common Stock to deliver in satisfaction of a sale by the Holder of the Warrant Stock which the Holder anticipated receiving upon such
exercise (a Buy-In), then the Issuer shall (1) pay in cash to the Holder the amount by which (x) the Holders total purchase price (including brokerage commissions, if any) for the shares of Common Stock so
purchased exceeds (y) the amount obtained by multiplying (A) the number of shares of Warrant Stock that the Issuer was required to deliver to the Holder in connection with the exercise at issue times (B) the price at which the sell
order giving rise to such purchase obligation was executed, and (2) at the option of the Holder, either reinstate the portion of the Warrant and equivalent number of shares of Warrant Stock for which such exercise was not honored or deliver to
the Holder the number of shares of Common Stock that would have been issued had the Issuer timely complied with its exercise and delivery obligations hereunder. For example, if the Holder purchases Common Stock having a total purchase price of
$11,000 to cover a Buy-In with respect to an attempted exercise of shares of Common Stock with an aggregate sale price giving rise to such purchase obligation of $10,000, under clause (1) of the immediately preceding sentence the Issuer shall
be required to pay the Holder $1,000. The Holder shall provide the Issuer written notice indicating the amounts payable to the Holder in respect of the Buy-In, together with applicable confirmations and other evidence reasonably requested by the
Issuer. Nothing herein shall limit a Holders right to pursue any other remedies available to it hereunder, at law or in equity including, without limitation, a decree of specific performance and/or injunctive relief with respect to the
Issuers failure to timely deliver certificates representing shares of Common Stock upon exercise of this Warrant as required pursuant to the terms hereof.

(f) Transferability of Warrant. Subject to Section 2(h), this Warrant may be transferred by a Holder without the consent of the Issuer. If transferred pursuant to this paragraph and subject to the
provisions of Section 2(h), this Warrant may be transferred on the books of the Issuer by the Holder hereof in person or by duly authorized attorney, upon surrender of this Warrant at the principal office of the Issuer, properly endorsed (by
the Holder executing an assignment in the form attached hereto) and upon payment of any necessary transfer tax or other governmental charge imposed upon such transfer. This Warrant is exchangeable at the principal office of the Issuer for Warrants
for the purchase of the same aggregate number of shares of Warrant Stock, each new Warrant to represent the right to purchase such number of shares of Warrant Stock as the Holder hereof shall designate at the time of such exchange. All Warrants
issued on transfers or exchanges shall be dated the Original Issue Date and shall be identical with this Warrant except as to the number of shares of Warrant Stock issuable pursuant hereto.

(g) Continuing Rights of Holder. The Issuer will, at the time of or at any time after each exercise of this Warrant, upon the request of the
Holder hereof, acknowledge in writing the extent, if any, of its continuing obligation to afford to such Holder all rights to which such Holder shall continue to be entitled after such exercise in accordance with the terms of this Warrant,
provided that if any such Holder shall fail to make any such request, the failure shall not affect the continuing obligation of the Issuer to afford such rights to such Holder.



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(h) Compliance with Securities Laws.

(i) The Holder of this Warrant, by acceptance hereof, acknowledges that this Warrant or the shares of Warrant Stock to be issued upon
exercise hereof are being acquired solely for the Holders own account and not as a nominee for any other party, and for investment, and that the Holder will not offer, sell or otherwise dispose of this Warrant or any shares of Warrant Stock to
be issued upon exercise hereof except pursuant to an effective registration statement, or an exemption from registration, under the Securities Act and any applicable state securities laws.

(ii) Except as provided in paragraph (iii) below, this Warrant and all certificates representing shares of Warrant Stock issued upon
exercise hereof shall be stamped or imprinted with a legend in substantially the following form:

THIS WARRANT AND THE SHARES OF COMMON
STOCK ISSUABLE UPON EXERCISE HEREOF HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE SECURITIES ACT) OR ANY STATE SECURITIES LAWS AND MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF UNLESS REGISTERED UNDER
THE SECURITIES ACT AND UNDER APPLICABLE STATE SECURITIES LAWS OR FIBERNET TELECOM GROUP, INC. SHALL HAVE RECEIVED AN OPINION OF ITS COUNSEL THAT REGISTRATION OF SUCH SECURITIES UNDER THE SECURITIES ACT AND UNDER THE PROVISIONS OF APPLICABLE STATE
SECURITIES LAWS IS NOT REQUIRED.

(iii) The Issuer agrees to reissue this Warrant or certificates representing any of the
Warrant Stock, without the legend set forth above if at such time, prior to making any transfer of any such securities, the Holder shall give written notice to the Issuer describing the manner and terms of such transfer; provided, that such proposed
transfer will not be effected (and the Issuer will not be obligated to remove any such legend) unless and until: (a) either (i) the Issuer has received an opinion of counsel reasonably satisfactory to the Issuer, to the effect that the
registration of such securities under the Securities Act is not required in connection with such proposed transfer, (ii) a registration statement under the Securities Act covering such proposed disposition has been filed by the Issuer with the
Securities and Exchange Commission and has become effective under the Securities Act and the Holder has represented that the Warrant Stock has been or will be sold, (iii) the Issuer has received other evidence reasonably satisfactory to the
Issuer that such registration and qualification under the Securities Act and state securities laws are not required, or (iv) the Holder provides the Issuer with reasonable assurances that such security can be sold pursuant to Rule 144 under the
Securities Act; and (b) either (i) the Issuer has received an opinion of counsel reasonably satisfactory to the Issuer, to the effect that registration or qualification under the securities or blue sky laws of any state is not
required in connection with such proposed disposition, or (ii) compliance with applicable state securities or blue sky laws has been effected or a valid exemption exists with respect thereto. The Issuer will respond to any such
notice from a holder



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within three (3) business days. In the case of any proposed transfer under this Section 2(h), the Issuer will use reasonable efforts to comply with
any such applicable state securities or blue sky laws, but shall in no event be required, (x) to qualify to do business in any state where it is not then qualified, (y) to take any action that would subject it to tax or to the
general service of process in any state where it is not then subject, or (z) to comply with state securities or blue sky laws of any state for which registration by coordination is unavailable to the Issuer. The restrictions on
transfer contained in this Section 2(h) shall be in addition to, and not by way of limitation of, any other restrictions on transfer contained in any other section of this Warrant. Whenever a certificate representing the Warrant Stock is
required to be issued to a the Holder without a legend, in lieu of delivering physical certificates representing the Warrant Stock, provided the Issuers transfer agent is participating in the DTC Fast Automated Securities Transfer program, the
Issuer shall cause its transfer agent to electronically transmit the Warrant Stock to the Holder by crediting the account of the Holders Prime Broker with DTC through its DWAC system (to the extent not inconsistent with any provisions of this
Warrant or the Purchase Agreement).

(i) Accredited Investor Status. In no event may the Holder exercise this Warrant in whole or in
part unless the Holder is an accredited investor as defined in Regulation D under the Securities Act.

3. Stock Fully Paid;
Reservation and Listing of Shares; Covenants.

(a) Stock Fully Paid. The Issuer represents, warrants, covenants and agrees that
all shares of Warrant Stock which may be issued upon the exercise of this Warrant or otherwise hereunder will, upon issuance, be duly authorized, validly issued, fully paid and non-assessable and free from all taxes, liens and charges created by or
through Issuer. The Issuer further covenants and agrees that during the period within which this Warrant may be exercised, the Issuer will at all times have authorized and reserved for the purpose of issuance upon exercise of this Warrant a
sufficient number of shares of Common Stock to provide for the exercise of this Warrant.

(b) Reservation. If any shares of Common
Stock required to be reserved for issuance upon exercise of this Warrant or as otherwise provided hereunder require registration or qualification with any governmental authority under any federal or state law before such shares may be so issued, the
Issuer will in good faith use its reasonable best efforts as expeditiously as possible at its expense to cause such shares to be duly registered or qualified. If the Issuer shall list any shares of Common Stock on any securities exchange or market
it will, at its expense, list thereon, maintain and increase when necessary such listing, of, all shares of Warrant Stock from time to time issued upon exercise of this Warrant or as otherwise provided hereunder (provided that such Warrant Stock has
been registered pursuant to a registration statement under the Securities Act then in effect), and, to the extent permissible under the applicable securities exchange rules, all unissued shares of Warrant Stock which are at any time issuable
hereunder, so long as any shares of Common Stock shall be so listed. The Issuer will also so list on each securities exchange or market, and will maintain such listing of, any other securities which the Holder of this Warrant shall be entitled to
receive upon the exercise of this Warrant if at the time any securities of the same class shall be listed on such securities exchange or market by the Issuer.



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(c) Covenants. The Issuer shall not by any action including, without limitation, amending the
Certificate of Incorporation or the by-laws of the Issuer, or through any reorganization, transfer of assets, consolidation, merger, dissolution, issue or sale of securities or any other action, avoid or seek to avoid the observance or performance
of any of the terms of this Warrant, but will at all times in good faith assist in the carrying out of all such terms and in the taking of all such actions as may be necessary or appropriate to protect the rights of the Holder hereof against
dilution (to the extent specifically provided herein) or impairment. Without limiting the generality of the foregoing, the Issuer will (i) not permit the par value, if any, of its Common Stock to exceed the then effective Warrant Price,
(ii) not amend or modify any provision of the Certificate of Incorporation or by-laws of the Issuer in any manner that would adversely affect the rights of the Holders of the Warrants, (iii) take all such action as may be reasonably
necessary in order that the Issuer may validly and legally issue fully paid and nonassessable shares of Common Stock, free and clear of any liens, claims, encumbrances and restrictions (other than as provided herein) upon the exercise of this
Warrant, and (iv) use its reasonable best efforts to obtain all such authorizations, exemptions or consents from any public regulatory body having jurisdiction thereof as may be reasonably necessary to enable the Issuer to perform its
obligations under this Warrant.

(d) Loss, Theft, Destruction of Warrants. Upon receipt of evidence satisfactory to the Issuer of
the ownership of and the loss, theft, destruction or mutilation of any Warrant, the Issuer will make and deliver, in lieu of such lost, stolen, destroyed or mutilated Warrant, a new Warrant of like tenor and representing the right to purchase the
same number of shares of Common Stock.

4. Adjustment of Warrant Price and Warrant Share Number. The price at which shares of Common
Stock may be purchased upon exercise of this Warrant shall be subject to adjustment from time to time as set forth in this Section 4. The Issuer shall give the Holder prompt notice of any event described below which requires an adjustment
pursuant to this Section 4 in accordance with Section 5. Notwithstanding anything contained herein to the contrary, the Warrant Price shall not be adjusted pursuant to Section 4(d), (e) and (f) hereof to a price that is less
than the Per Share Market Value on the Original Issue Date.



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(a) Recapitalization, Reorganization, Reclassification, Consolidation, Merger or Sale.

(i) In case the Issuer after the Original Issue Date shall do any of the following (each, a Triggering Event):
(a) consolidate or merge with or into any other Person and the Issuer shall not be the continuing or surviving corporation of such consolidation or merger, or (b) permit any other Person to consolidate with or merge into the Issuer and the
Issuer shall be the continuing or surviving Person but, in connection with such consolidation or merger, any Capital Stock of the Issuer shall be changed into or exchanged for Securities of any other Person or cash or any other property, or
(c) transfer all or substantially all of its properties or assets to any other Person, or (d) effect a capital reorganization or reclassification of its Capital Stock, then, and in the case of each such Triggering Event, proper provision
shall be made so that, upon the basis and the terms and in the manner provided in this Warrant, the Holder of this Warrant shall be entitled upon the exercise hereof at any time after the consummation of such Triggering Event, to the extent this
Warrant is not exercised prior to such Triggering Event, to receive at the Warrant Price in effect at the time immediately prior to the consummation of such Triggering Event in lieu of the Common Stock issuable upon such exercise of this Warrant
prior to such Triggering Event, the Securities, cash and property to which such Holder would have been entitled upon the consummation of such Triggering Event if such Holder had exercised the rights represented by this Warrant immediately prior
thereto (including the right of a shareholder to elect the type of consideration it will receive upon a Triggering Event), subject to adjustments (subsequent to such corporate action) as nearly equivalent as possible to the adjustments provided for
elsewhere in this Section 4. Notwithstanding the foregoing to the contrary, this Section 4(a)(i) shall only apply if the surviving entity pursuant to any such Triggering Event is a company that has a class of equity securities registered
pursuant to the Securities Exchange Act of 1934, as amended, and its common stock is listed or quoted on a national securities exchange, national automated quotation system or the OTC Bulletin Board. In the event that the surviving entity pursuant
to any such Triggering Event is not a public company that is registered pursuant to the Securities Exchange Act of 1934, as amended, or its common stock is not listed or quoted on a national securities exchange, national automated quotation system
or the OTC Bulletin Board, then the Holder shall have the right to demand that the Issuer pay to the Holder an amount equal to the value of this Warrant according to the Black-Scholes formula.

(ii) Notwithstanding anything contained in this Warrant to the contrary and so long as the surviving entity pursuant to any Triggering
Event is a company that has a class of equity securities registered pursuant to the Securities Exchange Act of 1934, as amended, and its common stock is listed or quoted on a national securities exchange, national automated quotation system or the
OTC Bulletin Board, a Triggering Event shall not be deemed to have occurred if, prior to the consummation thereof, each Person (other than the Issuer) which may be required to deliver any Securities, cash or property upon the exercise of this
Warrant as provided herein shall assume, by written instrument delivered to, and reasonably satisfactory to, the Holder of this Warrant, (A) the obligations of the Issuer under this Warrant (and if the Issuer shall survive the consummation of
such Triggering Event, such assumption shall be in addition to, and shall not release the Issuer from, any continuing obligations of the Issuer under this Warrant) and (B) the obligation to deliver to such Holder such Securities, cash or



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property as, in accordance with the foregoing provisions of this subsection (a), such Holder shall be entitled to receive, and such Person shall have
similarly delivered to such Holder an opinion of counsel for such Person, which counsel shall be reasonably satisfactory to such Holder, or in the alternative, a written acknowledgement executed by the President or Chief Financial Officer of the
Issuer, stating that this Warrant shall thereafter continue in full force and effect and the terms hereof (including, without limitation, all of the provisions of this subsection (a)) shall be applicable to the Securities, cash or property which
such Person may be required to deliver upon any exercise of this Warrant or the exercise of any rights pursuant hereto.

(b) Stock
Dividends, Subdivisions and Combinations. If at any time the Issuer shall:

(i) take a record of the holders of its
Common Stock for the purpose of entitling them to receive a dividend payable in, or other distribution of, shares of Common Stock,

(ii) subdivide its outstanding shares of Common Stock into a larger number of shares of Common Stock, or

(iii)
combine its outstanding shares of Common Stock into a smaller number of shares of Common Stock,

then (1) the number of shares of Common Stock for
which this Warrant is exercisable immediately after the occurrence of any such event shall be adjusted to equal the number of shares of Common Stock which a record holder of the same number of shares of Common Stock for which this Warrant is
exercisable immediately prior to the occurrence of such event would own or be entitled to receive after the happening of such event, and (2) the Warrant Price then in effect shall be adjusted to equal (A) the Warrant Price then in effect
multiplied by the number of shares of Common Stock for which this Warrant is exercisable immediately prior to the adjustment divided by (B) the number of shares of Common Stock for which this Warrant is exercisable immediately after such
adjustment.

(c) Certain Other Distributions. If at any time the Issuer shall take a record of the holders of its Common Stock for
the purpose of entitling them to receive any dividend or other distribution of:

(i) cash (other than a cash dividend
payable out of earnings or earned surplus legally available for the payment of dividends under the laws of the jurisdiction of incorporation of the Issuer),

(ii) any evidences of its indebtedness, any shares of stock of any class or any other securities or property of any nature whatsoever
(other than cash, Common Stock Equivalents or Additional Shares of Common Stock), or

(iii) any warrants or other rights to
subscribe for or purchase any evidences of its indebtedness, any shares of stock of any class or any other securities or property of any nature whatsoever (other than cash, Common Stock Equivalents or Additional Shares of Common Stock),



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then (1) the number of shares of Common Stock for which this Warrant is exercisable shall be adjusted to equal the
product of the number of shares of Common Stock for which this Warrant is exercisable immediately prior to such adjustment multiplied by a fraction (A) the numerator of which shall be the Per Share Market Value of Common Stock at the date of
taking such record and (B) the denominator of which shall be such Per Share Market Value minus the amount allocable to one share of Common Stock of any such cash so distributable and of the fair value (as determined in good faith by the Board
of Directors of the Issuer and supported by an opinion from an investment banking firm of recognized national standing acceptable to (but not affiliated with) the Holder) of any and all such evidences of indebtedness, shares of stock, other
securities or property or warrants or other subscription or purchase rights so distributable, and (2) the Warrant Price then in effect shall be adjusted to equal (A) the Warrant Price then in effect multiplied by the number of shares of
Common Stock for which this Warrant is exercisable immediately prior to the adjustment divided by (B) the number of shares of Common Stock for which this Warrant is exercisable immediately after such adjustment. A reclassification of the Common
Stock (other than a change in par value, or from par value to no par value or from no par value to par value) into shares of Common Stock and shares of any other class of stock shall be deemed a distribution by the Issuer to the holders of its
Common Stock of such shares of such other class of stock within the meaning of this Section 4(c) and, if the outstanding shares of Common Stock shall be changed into a larger or smaller number of shares of Common Stock as a part of such
reclassification, such change shall be deemed a subdivision or combination, as the case may be, of the outstanding shares of Common Stock within the meaning of Section 4(b).

(d) Issuance of Additional Shares of Common Stock.

(i) Subject to the first paragraph of Section 4 hereof, in the event the Issuer shall at any time issue any Additional Shares of Common Stock (otherwise than as provided in the foregoing subsections
(b) through (c) of this Section 4), at a price per share less than the Warrant Price then in effect or without consideration, then the Warrant Price upon each such issuance shall be adjusted to that price determined by multiplying the
Warrant Price then in effect by a fraction:

(A) the numerator of which shall be equal to the sum of (x) the number of
shares of Outstanding Common Stock immediately prior to the issuance of such Additional Shares of Common Stock plus (y) the number of shares of Common Stock which the aggregate consideration for the total number of such Additional Shares
of Common Stock so issued would purchase at a price per share equal to the Warrant Price then in effect, and

(B) the
denominator of which shall be equal to the number of shares of Outstanding Common Stock immediately after the issuance of such Additional Shares of Common Stock.

(ii) The provisions of paragraph (i) of Section 4(d) shall not apply to any issuance of Additional Shares of Common Stock for
which an adjustment is provided under Section 4(b) or 4(c). No adjustment of the number of shares of Common Stock for which this Warrant shall be exercisable shall be made under paragraph (i) of Section 4(d) upon the issuance



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of any Additional Shares of Common Stock which are issued pursuant to the exercise of any Common Stock Equivalents, if any such adjustment shall previously
have been made upon the issuance of such Common Stock Equivalents (or upon the issuance of any warrant or other rights therefor) pursuant to Section 4(e) or Section 4(f).

(e) Issuance of Warrants or Other Rights. If at any time the Issuer shall take a record of the holders of its Common Stock for the purpose of
entitling them to receive a distribution of, or shall in any manner (whether directly or by assumption in a merger in which the Issuer is the surviving corporation) issue or sell, any Common Stock Equivalents (or issue any warrant or other rights
therefor), whether or not the rights to exchange or convert thereunder are immediately exercisable, and the price per share for which Common Stock is issuable upon the exercise of such Common Stock Equivalents (or any warrant or other rights
therefor) shall be less than the Warrant Price in effect immediately prior to the time of such issue or sale, then (i) the number of Warrant Shares shall be adjusted to equal that number of Warrant Shares the Holder would have been entitled to
receive after the happening of any of the events described in this Section 4(e) if such Warrant Shares had been issued immediately prior to the happening of such event, such adjustment to become effective concurrently with the effectiveness of
such event, and (ii) the Warrant Price then in effect shall be adjusted as provided in Section 4(d) on the basis that the maximum number of Additional Shares of Common Stock issuable pursuant to all such Common Stock Equivalents (or upon
the issuance of any warrant or other rights therefor) shall be deemed to have been issued and outstanding and the Issuer shall have received all of the consideration payable therefor, if any, as of the date of the actual issuance of such warrants or
other rights. No adjustments of the Warrant Price then in effect or the number of Warrant Shares for which this Warrant is exercisable shall be made upon the actual issue of such Common Stock or of such Common Stock Equivalents upon exercise of such
warrants or other rights or upon the actual issue of such Common Stock upon such conversion or exchange of such Common Stock Equivalents.

(f) Issuance of Common Stock Equivalents. If at any time the Issuer shall take a record of the holders of its Common Stock for the purpose of entitling them to receive a distribution of, or shall in any manner (whether directly or by
assumption in a merger in which the Issuer is the surviving corporation) issue or sell, any Common Stock Equivalents, whether or not the rights to exchange or convert thereunder are immediately exercisable, and the price per share for which Common
Stock is issuable upon such conversion or exchange shall be less than the Warrant Price in effect immediately prior to the time of such issue or sale, then (i) the number of Warrant Shares shall be adjusted to equal that number of Warrant
Shares the Holder would have been entitled to receive after the happening of any of the events described in this Section 4(f) if such Warrant Shares had been issued immediately prior to the happening of such event, such adjustment to become
effective concurrently with the effectiveness of such event, and (ii) and the Warrant Price then in effect shall be adjusted as provided in Section 4(d) on the basis that the maximum number of Additional Shares of Common Stock necessary to
effect the conversion or exchange of all such Common Stock Equivalents shall be deemed to have been issued and outstanding and the Issuer shall have received all of the consideration payable therefor, if any, as of the date of actual issuance of
such Common Stock Equivalents. No further adjustment of the number of shares of Common Stock for which this Warrant is exercisable and the Warrant Price then in effect shall be made under this Section 4(f) upon the issuance of any Common Stock
Equivalents which are issued pursuant to the exercise of any warrants or other subscription or purchase rights therefor, if any such adjustment shall previously have been made



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upon the issuance of such warrants or other rights pursuant to Section 4(e). No further adjustments of the number of shares of Common Stock for which
this Warrant is exercisable and the Warrant Price then in effect shall be made upon the actual issue of such Common Stock upon conversion or exchange of such Common Stock Equivalents.

(g) Superseding Adjustment. If, at any time after any adjustment of the number of shares of Common Stock for which this Warrant is exercisable and
the Warrant Price then in effect shall have been made pursuant to Section 4(e) or Section 4(f) as the result of any issuance of warrants, other rights or Common Stock Equivalents, and (i) such warrants or other rights, or the right of
conversion or exchange in such other Common Stock Equivalents, shall expire, and all or a portion of such warrants or other rights, or the right of conversion or exchange with respect to all or a portion of such other Common Stock Equivalents, as
the case may be shall not have been exercised, or (ii) the consideration per share for which shares of Common Stock are issuable pursuant to such Common Stock Equivalents, shall be increased solely by virtue of provisions therein contained for
an automatic increase in such consideration per share upon the occurrence of a specified date or event, then for each outstanding Warrant such previous adjustment shall be rescinded and annulled and the Additional Shares of Common Stock which were
deemed to have been issued by virtue of the computation made in connection with the adjustment so rescinded and annulled shall no longer be deemed to have been issued by virtue of such computation. Upon the occurrence of an event set forth in this
Section 4(g) above, there shall be a recomputation made of the effect of such Common Stock Equivalents on the basis of: (i) treating the number of Additional Shares of Common Stock or other property, if any, theretofore actually issued or
issuable pursuant to the previous exercise of any such warrants or other rights or any such right of conversion or exchange, as having been issued on the date or dates of any such exercise and for the consideration actually received and receivable
therefor, and (ii) treating any such Common Stock Equivalents which then remain outstanding as having been granted or issued immediately after the time of such increase of the consideration per share for which shares of Common Stock or other
property are issuable under such Common Stock Equivalents; whereupon a new adjustment of the number of shares of Common Stock for which this Warrant is exercisable and the Warrant Price then in effect shall be made, which new adjustment shall
supersede the previous adjustment so rescinded and annulled.

(h) Purchase of Common Stock by the Issuer. If the Issuer at any time
while this Warrant is outstanding shall, directly or indirectly through a Subsidiary or otherwise, purchase, redeem or otherwise acquire any shares of Common Stock at a price per share greater than the Per Share Market Value, then the Warrant Price
upon each such purchase, redemption or acquisition shall be adjusted to that price determined by multiplying such Warrant Price by a fraction (i) the numerator of which shall be the number of shares of Outstanding Common Stock immediately prior
to such purchase, redemption or acquisition minus the number of shares of Common Stock which the aggregate consideration for the total number of such shares of Common Stock so purchased, redeemed or acquired would purchase at the Per Share Market
Value; and (ii) the denominator of which shall be the number of shares of Outstanding Common Stock immediately after such purchase, redemption or acquisition. For the purposes of this subsection (h), the date as of which the Per Share Market
Price shall be computed shall be the earlier of (x) the date on which the Issuer shall enter into a firm contract for the purchase, redemption or acquisition of such Common Stock, or (y) the date of actual purchase, redemption or
acquisition of such Common Stock. For the purposes of this subsection (h), a purchase, redemption or acquisition of a Common Stock Equivalent shall be deemed to be a purchase of



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the underlying Common Stock, and the computation herein required shall be made on the basis of the full exercise, conversion or exchange of such Common Stock
Equivalent on the date as of which such computation is required hereby to be made, whether or not such Common Stock Equivalent is actually exercisable, convertible or exchangeable on such date.

(i) Other Provisions applicable to Adjustments under this Section. The following provisions shall be applicable to the making of adjustments of
the number of shares of Common Stock for which this Warrant is exercisable and the Warrant Price then in effect provided for in this Section 4:

(i) Computation of Consideration. To the extent that any Additional Shares of Common Stock or any Common Stock Equivalents (or any warrants or other rights therefor) shall be issued for cash consideration, the
consideration received by the Issuer therefor shall be the amount of the cash received by the Issuer therefor, or, if such Additional Shares of Common Stock or Common Stock Equivalents are offered by the Issuer for subscription, the subscription
price, or, if such Additional Shares of Common Stock or Common Stock Equivalents are sold to underwriters or dealers for public offering without a subscription offering, the initial public offering price (in any such case subtracting any amounts
paid or receivable for accrued interest or accrued dividends and without taking into account any compensation, discounts or expenses paid or incurred by the Issuer for and in the underwriting of, or otherwise in connection with, the issuance
thereof). To the extent that such issuance shall be for a consideration other than cash, then, except as herein otherwise expressly provided, the amount of such consideration shall be deemed to be the fair value of such consideration at the time of
such issuance as determined in good faith by the Board of Directors of the Issuer. In case any Additional Shares of Common Stock or any Common Stock Equivalents (or any warrants or other rights therefor) shall be issued in connection with any merger
in which the Issuer issues any securities, the amount of consideration therefor shall be deemed to be the fair value, as determined in good faith by the Board of Directors of the Issuer, of such portion of the assets and business of the nonsurviving
corporation as such Board in good faith shall determine to be attributable to such Additional Shares of Common Stock, Common Stock Equivalents, or any warrants or other rights therefor, as the case may be. The consideration for any Additional Shares
of Common Stock issuable pursuant to any warrants or other rights to subscribe for or purchase the same shall be the consideration received by the Issuer for issuing such warrants or other rights plus the additional consideration payable to the
Issuer upon exercise of such warrants or other rights. The consideration for any Additional Shares of Common Stock issuable pursuant to the terms of any Common Stock Equivalents shall be the consideration received by the Issuer for issuing warrants
or other rights to subscribe for or purchase such Common Stock Equivalents, plus the consideration paid or payable to the Issuer in respect of the subscription for or purchase of such Common Stock Equivalents, plus the additional consideration, if
any, payable to the Issuer upon the exercise of the right of conversion or exchange in such Common Stock Equivalents. In case of the issuance at any time of any Additional Shares of Common Stock or Common Stock Equivalents in payment or satisfaction
of any dividends upon any class of stock other than Common Stock, the Issuer shall be deemed to have received for such Additional Shares of Common Stock or Common Stock Equivalents a consideration equal to the amount of such dividend so paid or
satisfied.

(ii) When Adjustments to Be Made. The adjustments required by this Section 4 shall be made whenever
and as often as any specified event requiring an adjustment shall



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occur, except that any adjustment of the number of shares of Common Stock for which this Warrant is exercisable that would otherwise be required may be
postponed (except in the case of a subdivision or combination of shares of the Common Stock, as provided for in Section 4(b)) up to, but not beyond the date of exercise if such adjustment either by itself or with other adjustments not
previously made adds or subtracts less than one percent (1%) of the shares of Common Stock for which this Warrant is exercisable immediately prior to the making of such adjustment. Any adjustment representing a change of less than such minimum
amount (except as aforesaid) which is postponed shall be carried forward and made as soon as such adjustment, together with other adjustments required by this Section 4 and not previously made, would result in a minimum adjustment or on the
date of exercise. For the purpose of any adjustment, any specified event shall be deemed to have occurred at the close of business on the date of its occurrence.

(iii) Fractional Interests. In computing adjustments under this Section 4, fractional interests in Common Stock shall be taken
into account to the nearest one one-hundredth (1/100th) of a share.

(iv) When Adjustment Not Required. If the Issuer shall take a record of the holders of its Common Stock for the purpose of
entitling them to receive a dividend or distribution or subscription or purchase rights and shall, thereafter and before the distribution to stockholders thereof, legally abandon its plan to pay or deliver such dividend, distribution, subscription
or purchase rights, then thereafter no adjustment shall be required by reason of the taking of such record and any such adjustment previously made in respect thereof shall be rescinded and annulled.

(j) Form of Warrant after Adjustments. The form of this Warrant need not be changed because of any adjustments in the Warrant Price or the number
and kind of Securities purchasable upon the exercise of this Warrant.

(k) Escrow of Warrant Stock. If after any property
becomes distributable pursuant to this Section 4 by reason of the taking of any record of the holders of Common Stock, but prior to the occurrence of the event for which such record is taken, and the Holder exercises this Warrant, any shares of
Common Stock issuable upon exercise by reason of such adjustment shall be deemed the last shares of Common Stock for which this Warrant is exercised (notwithstanding any other provision to the contrary herein) and such shares or other property shall
be held in escrow for the Holder by the Issuer to be issued to the Holder upon and to the extent that the event actually takes place, upon payment of the current Warrant Price. Notwithstanding any other provision to the contrary herein, if the event
for which such record was taken fails to occur or is rescinded, then such escrowed shares shall be cancelled by the Issuer and escrowed property returned.

5. Notice of Adjustments. Whenever the Warrant Price or Warrant Share Number shall be adjusted pursuant to Section 4 hereof (for purposes of this Section 5, each an adjustment), the Issuer
shall cause its Chief Financial Officer to prepare and execute a certificate setting forth, in reasonable detail, the event requiring the adjustment, the amount of the adjustment, the method by which such adjustment was calculated (including a
description of the basis on which the Board made any determination hereunder), and the Warrant Price and Warrant Share Number after giving effect to such adjustment, and shall cause copies of such



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certificate to be delivered to the Holder of this Warrant promptly after each adjustment. Any dispute between the Issuer and the Holder of this Warrant with
respect to the matters set forth in such certificate may at the option of the Holder of this Warrant be submitted to one of the national accounting firms currently known as the big five selected by the Holder, provided that the
Issuer shall have ten (10) days after receipt of notice from such Holder of its selection of such firm to object thereto, in which case such Holder shall select another such firm and the Issuer shall have no such right of objection. The firm
selected by the Holder of this Warrant as provided in the preceding sentence shall be instructed to deliver a written opinion as to such matters to the Issuer and such Holder within thirty (30) days after submission to it of such dispute. Such
opinion shall be final and binding on the parties hereto.

6. Fractional Shares. No fractional shares of Warrant Stock will be
issued in connection with and exercise hereof, but in lieu of such fractional shares, the Issuer shall round the number of shares to be issued upon exercise up to the nearest whole number of shares.

7. Ownership Cap and Certain Exercise Restrictions. (a) Notwithstanding anything to the contrary set forth in this Warrant, at no time may a
Holder of this Warrant exercise this Warrant if the number of shares of Common Stock to be issued pursuant to such exercise would exceed, when aggregated with all other shares of Common Stock beneficially owned by such Holder (as determined in
accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended, and the rules thereunder), 4.9% of the then issued and outstanding shares of Common Stock; provided, however, that upon a holder of this Warrant
providing the Issuer with sixty-one (61) days notice (pursuant to Section 13 hereof) (the Waiver Notice) that such Holder would like to waive this Section 7(a) with regard to any or all shares of Common Stock issuable upon
exercise of this Warrant, this Section 7(a) will be of no force or effect with regard to all or a portion of the Warrant referenced in the Waiver Notice; provided, further, that this provision shall be of no further force or
effect (i) during the sixty-one (61) days immediately preceding the expiration of the term of this Warrant or (ii) upon the Holders receipt of a Early Termination Notice (as defined in Section 8 hereof).

(b) Notwithstanding anything to the contrary set forth in this Warrant, at no time may a Holder of this Warrant exercise this Warrant if
the number of shares of Common Stock to be issued pursuant to such exercise would exceed, when aggregated with all other shares of Common Stock beneficially owned by such Holder (as determined in accordance with Section 13(d) of the Securities
Exchange Act of 1934, as amended, and the rules thereunder), 9.9% of the then issued and outstanding shares of Common Stock; provided, however, that upon a holder of this Warrant providing the Issuer with a Waiver Notice that such
Holder would like to waive this Section 7(b) with regard to any or all shares of Common Stock issuable upon exercise of this Warrant, this Section 7(b) will be of no force or effect with regard to all or a portion of the Warrant referenced
in the Waiver Notice; provided, further, that this provision shall be of no further force or effect (i) during the sixty-one (61) days immediately preceding the expiration of the term of this Warrant or (ii) upon the
Holders receipt of a Early Termination Notice.

8. Early Termination. Notwithstanding anything herein to the contrary,
commencing six (6) months and one (1) day following the Original Issue Date, the Issuer may provide the Holder of this Warrant written notice pursuant to Section 13 (the Early Termination Notice) if (a) the
Issuer enters into a merger or acquisition, in one or a series of related transactions, that results in the issuance of at least forty percent (40%) of the shares of Common



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Stock issued and outstanding at such time (the Transaction Triggering Event) and (b) (i) at any time within ninety
(90) days following the Transaction Triggering Event, the Per Share Market Value of the Common Stock has been equal to or greater than $5.25 (as may be adjusted for any stock splits or combinations of the Common Stock) for a period of ten
(10) consecutive Trading Days immediately prior to the date of delivery of the Early Termination Notice or (ii) at any time following the date that is ninety (90) days following the Transaction Triggering Event, the Per Share Market
Value of the Common Stock has been equal to or greater than $3.50 (as may be adjusted for any stock splits or combinations of the Common Stock) for a period of ten (10) consecutive Trading Days immediately prior to the date of delivery of the
Early Termination Notice; provided, that (i) a registration statement under the Securities Act providing for the resale of the Warrant Stock and the Common Stock issued pursuant to the Purchase Agreement is then in effect and has
been effective, without lapse or suspension of any kind, for a period of 60 consecutive calendar days, (ii) trading in the Common Stock shall not have been suspended by the Securities and Exchange Commission or Nasdaq, and (iii) the Issuer
is in material compliance with the terms and conditions of this Warrant and the other Transaction Documents (as defined in the Purchase Agreement); provided, further, that a registration statement under the Securities Act providing for
the resale of the Warrant Stock and the Common Stock issued pursuant to the Purchase Agreement is in effect from the date of delivery of the Early Termination Notice until the date which is the later of (A) the date the Holder exercises the
Warrant pursuant to the Early Termination Notice and (B) the 10thTrading Day after the Holder receives the
Early Termination Notice (the Early Termination Date). The rights and privileges granted pursuant to this Warrant with respect to the shares of Warrant Stock subject to the Early Termination Notice (the Early Termination
Warrant Shares) shall expire on the Early Termination Date if this Warrant is not exercised with respect to such Early Termination Warrant Shares prior to such Early Termination Date. In the event this Warrant is not exercised with respect
to the Early Termination Warrant Shares, the Issuer shall remit to the Holder of this Warrant (1) $.001 per Early Termination Warrant Share and (2) a new Warrant representing the number of shares of Warrant Stock, if any, which shall not
have been subject to the Early Termination Notice upon the Holder tendering to the Issuer the applicable Warrant certificate.

9.
Definitions. For the purposes of this Warrant, the following terms have the following meanings:

Additional
Shares of Common Stock means all shares of Common Stock issued by the Issuer after the Original Issue Date, and all shares of Other Common, if any, issued by the Issuer after the Original Issue Date, except: (1) shares of Common Stock
to be issued to strategic partners and/or in connection with a strategic merger or acquisition; (2) shares of Common Stock or the issuance of options to purchase shares of Common Stock to employees, officers, directors, consultants and vendors
in accordance with the Issuers equity incentive plan; (3) the issuance of securities pursuant to a bona fide firm underwritten public offering of the Issuers securities; (4) the conversion or exercise of convertible or
exercisable securities issued or outstanding on or prior to the date hereof; (5) up to an aggregate of 250,000 shares of Common Stock (as may be adjusted for any stock splits or combinations of the Common Stock) to be issued to settle pending
and threatened litigation against the Issuer; (6) up to an aggregate of 500,000 shares of Common Stock (as may be adjusted for any stock splits or combinations of the Common Stock) to be issued in satisfaction of the Issuers outstanding
liabilities, including, but not limited to, currently existing obligations under the Issuers real estate leases; and (7)



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equity securities to be issued upon the conversion of debt securities of the Issuer at a conversion price above the Per Share Purchase Price (as defined in
the Purchase Agreement).

Board shall mean the Board of Directors of the Issuer.

Capital Stock means and includes (i) any and all shares, interests, participations or other equivalents of or
interests in (however designated) corporate stock, including, without limitation, shares of preferred or preference stock, (ii) all partnership interests (whether general or limited) in any Person which is a partnership, (iii) all
membership interests or limited liability company interests in any limited liability company, and (iv) all equity or ownership interests in any Person of any other type.

Certificate of Incorporation means the Certificate of Incorporation of the Issuer as in effect on the Original Issue
Date, and as hereafter from time to time amended, modified, supplemented or restated in accordance with the terms hereof and thereof and pursuant to applicable law.

Common Stock means the Common Stock, par value $.001 per share, of the Issuer and any other Capital Stock into which
such stock may hereafter be changed.

Common Stock Equivalent means any Convertible Security or warrant,
option or other right to subscribe for or purchase any Additional Shares of Common Stock or any Convertible Security.

Convertible Securities means evidences of Indebtedness, shares of Capital Stock or other Securities which are or may be at any time convertible into or exchangeable for Additional Shares of Common Stock. The term
Convertible Security means one of the Convertible Securities.

Governmental Authority means
any governmental, regulatory or self-regulatory entity, department, body, official, authority, commission, board, agency or instrumentality, whether federal, state or local, and whether domestic or foreign.

Holders mean the Persons who shall from time to time own any Warrant. The term Holder means one of the
Holders.

Independent Appraiser means a nationally recognized or major regional investment banking firm
or firm of independent certified public accountants of recognized standing (which may be the firm that regularly examines the financial statements of the Issuer) that is regularly engaged in the business of appraising the Capital Stock or assets of
corporations or other entities as going concerns, and which is not affiliated with either the Issuer or the Holder of any Warrant.

Issuer means FiberNet Telecom Group, Inc., a Delaware corporation, and its successors.



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Majority Holders means at any time the Holders of Warrants exercisable
for a majority of the shares of Warrant Stock issuable under the Warrants at the time outstanding.

Nasdaq means the Nasdaq Capital Market.

Original Issue Date means
March 22, 2006.

OTC Bulletin Board means the over-the-counter electronic bulletin board.

Other Common means any other Capital Stock of the Issuer of any class which shall be authorized at any
time after the date of this Warrant (other than Common Stock) and which shall have the right to participate in the distribution of earnings and assets of the Issuer without limitation as to amount.

Outstanding Common Stock means, at any given time, the aggregate amount of outstanding shares of Common Stock, assuming
full exercise, conversion or exchange (as applicable) of all options, warrants and other Securities which are convertible into or exercisable or exchangeable for, and any right to subscribe for, shares of Common Stock that are outstanding at such
time.

Person means an individual, corporation, limited liability company, partnership, joint stock
company, trust, unincorporated organization, joint venture, Governmental Authority or other entity of whatever nature.

Per Share Market Value means on any particular date (a) the closing bid price per share of the Common Stock on such date on Nasdaq or another registered national stock exchange on which the Common Stock is then
listed, or if there is no such price on such date, then the closing bid price on such exchange or quotation system on the date nearest preceding such date, or (b) if the Common Stock is not listed then on Nasdaq or any registered national stock
exchange, the closing bid price for a share of Common Stock in the over-the-counter market, as reported by the OTC Bulletin Board or in the National Quotation Bureau Incorporated or similar organization or agency succeeding to its functions of
reporting prices) at the close of business on such date, or (c) if the Common Stock is not then reported by the OTC Bulletin Board or the National Quotation Bureau Incorporated (or similar organization or agency succeeding to its functions of
reporting prices), then the average of the Pink Sheet quotes for the five (5) Trading Days preceding such date of determination, or (d) if the Common Stock is not then publicly traded the fair market value of a share of Common
Stock as determined by an Independent Appraiser selected in good faith by the Majority Holders; provided, however, that the Issuer, after receipt of the determination by such Independent Appraiser, shall have the right to select an
additional Independent Appraiser, in which case, the fair market value shall be equal to the average of the determinations by each such Independent Appraiser; and provided, further that all determinations of the Per Share Market Value
shall be appropriately adjusted for any stock dividends, stock splits or other similar transactions during such period. The determination of fair market value by an Independent Appraiser shall be based upon the fair market value of the Issuer
determined on a going concern basis as between a willing buyer and a willing seller and



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taking into account all relevant factors determinative of value, and shall be final and binding on all parties. In determining the fair market value of any
shares of Common Stock, no consideration shall be given to any restrictions on transfer of the Common Stock imposed by agreement or by federal or state securities laws, or to the existence or absence of, or any limitations on, voting rights.

Purchase Agreement means the Common Stock Purchase Agreement dated as of March 22, 2006, among the
Issuer and the Purchasers.

Purchasers means the purchasers of Common Stock and Warrants issued by the
Issuer pursuant to the Purchase Agreement.

Securities means any debt or equity securities of the Issuer,
whether now or hereafter authorized, any instrument convertible into or exchangeable for Securities or a Security, and any option, warrant or other right to purchase or acquire any Security. Security means one of the Securities.

Securities Act means the Securities Act of 1933, as amended, or any similar federal statute then in
effect.

Subsidiary means any corporation at least 50% of whose outstanding Voting Stock shall at the
time be owned directly or indirectly by the Issuer or by one or more of its Subsidiaries, or by the Issuer and one or more of its Subsidiaries.

Term has the meaning specified in Section 1 hereof.

Trading Day means (a) a day on which the Common Stock is traded on Nasdaq, or (b) if the Common Stock is not listed on Nasdaq, a day on which the Common Stock is traded on any other registered national stock
exchange, or (c) if the Common Stock is not traded on any other registered national stock exchange, a day on which the Common Stock is traded on the OTC Bulletin Board, or (d) if the Common Stock is not traded on the OTC Bulletin Board, a
day on which the Common Stock is quoted in the over-the-counter market as reported by the National Quotation Bureau Incorporated (or any similar organization or agency succeeding its functions of reporting prices); provided, however,
that in the event that the Common Stock is not listed or quoted as set forth in (a), (b) and (c) hereof, then Trading Day shall mean any day except Saturday, Sunday and any day which shall be a legal holiday or a day on which banking
institutions in the State of New York are authorized or required by law or other government action to close.

Voting Stock means, as applied to the Capital Stock of any corporation, Capital Stock of any class or classes (however designated) having ordinary voting power for the election of a majority of the members of the Board of
Directors (or other governing body) of such corporation, other than Capital Stock having such power only by reason of the happening of a contingency.

Warrants means the Warrants issued and sold pursuant to the Purchase Agreement, including, without limitation, this Warrant, and any other warrants of like



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tenor issued in substitution or exchange for any thereof pursuant to the provisions of Section 2(c), 2(d) or 2(e) hereof or of any of such other
Warrants.

Warrant Price initially means U.S. $2.64, as such price may be adjusted from time to time as
shall result from the adjustments specified in this Warrant, including Section 4 hereto.

Warrant Share
Number means at any time the aggregate number of shares of Warrant Stock which may at such time be purchased upon exercise of this Warrant, after giving effect to all prior adjustments and increases to such number made or required to be
made under the terms hereof.

Warrant Stock means Common Stock issuable upon exercise of any Warrant or
Warrants or otherwise issuable pursuant to any Warrant or Warrants.

10. Other Notices. In case at any time:



| | (A) | the Issuer shall make any distributions to the holders of Common Stock; or
| | --- | --------------------------------------------------------------------------



| | (B) | the Issuer shall authorize the granting to all holders of its Common Stock of rights to subscribe for or purchase any shares of Capital Stock of any class or other rights; or
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (C) | there shall be any reclassification of the Capital Stock of the Issuer; or
| | --- | --------------------------------------------------------------------------



| | (D) | there shall be any capital reorganization by the Issuer; or
| | --- | -----------------------------------------------------------



| | (E) | there shall be any (i) consolidation or merger involving the Issuer or (ii) sale, transfer or other disposition of all or substantially all of the Issuers property,
assets or business (except a merger or other reorganization in which the Issuer shall be the surviving corporation and its shares of Capital Stock shall continue to be outstanding and unchanged and except a consolidation, merger, sale, transfer or
other disposition involving a wholly-owned Subsidiary); or
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | (F) | there shall be a voluntary or involuntary dissolution, liquidation or winding-up of the Issuer or any partial liquidation of the Issuer or distribution to holders of Common Stock;
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

then, in each of such cases, the Issuer shall give written notice to the Holder of the date on which (i) the books of the Issuer shall
close or a record shall be taken for such dividend, distribution or subscription rights or (ii) such reorganization, reclassification, consolidation, merger, disposition, dissolution, liquidation or winding-up, as the case may be, shall take
place. Such notice also shall specify the date as of which the holders of Common Stock of record shall participate in such dividend, distribution or subscription rights, or shall be entitled to exchange their certificates for Common Stock for
securities or other property deliverable upon such reorganization, reclassification, consolidation, merger, disposition, dissolution, liquidation or winding-up, as the case may be. Such notice shall be given at least twenty (20) days prior to
the



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action in question and not less than ten (10) days prior to the record date or the date on which the Issuers transfer books are closed in respect
thereto. This Warrant entitles the Holder to receive copies of all financial and other information distributed or required to be distributed to the holders of the Common Stock.

11. Amendment and Waiver. Any term, covenant, agreement or condition in this Warrant may be amended, or compliance therewith may be waived (either
generally or in a particular instance and either retroactively or prospectively), by a written instrument or written instruments executed by the Issuer and the Majority Holders; provided, however, that no such amendment or waiver shall
reduce the Warrant Share Number, increase the Warrant Price, shorten the period during which this Warrant may be exercised or modify any provision of this Section 11 without the consent of the Holder of this Warrant. No consideration shall be
offered or paid to any person to amend or consent to a waiver or modification of any provision of this Warrant unless the same consideration is also offered to all holders of the Warrants.

12. Governing Law; Jurisdiction. This Warrant shall be governed by and construed in accordance with the internal laws of the State of New York,
without giving effect to any of the conflicts of law principles which would result in the application of the substantive law of another jurisdiction. This Warrant shall not be interpreted or construed with any presumption against the party causing
this Warrant to be drafted. The Issuer and the Holder agree that venue for any dispute arising under this Warrant will lie exclusively in the state or federal courts located in New York County, New York, and the parties irrevocably waive any right
to raise forum non conveniens or any other argument that New York is not the proper venue. The Issuer and the Holder irrevocably consent to personal jurisdiction in the state and federal courts of the state of New York. The Issuer and the
Holder consent to process being served in any such suit, action or proceeding by mailing a copy thereof to such party at the address in effect for notices to it under this Warrant and agrees that such service shall constitute good and sufficient
service of process and notice thereof. Nothing in this Section 12 shall affect or limit any right to serve process in any other manner permitted by law. The Issuer and the Holder hereby agree that the prevailing party in any suit, action or
proceeding arising out of or relating to this Warrant or the Purchase Agreement, shall be entitled to reimbursement for reasonable legal fees from the non-prevailing party. The parties hereby waive all rights to a trial by jury.



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13. Notices. Any and all notices or other communications or deliveries required or permitted to be
provided hereunder shall be in writing and shall be deemed given and effective on the earlier of (i) the date of transmission, if such notice or communication is delivered via facsimile at the facsimile telephone number specified for notice
prior to 5:00 p.m., eastern time, on a Trading Day, (ii) the Trading Day after the date of transmission, if such notice or communication is delivered via facsimile at the facsimile telephone number specified for notice later than 5:00 p.m.,
eastern time, on any date and earlier than 11:59 p.m., eastern time, on such date, (iii) the Trading Day following the date of mailing, if sent by nationally recognized overnight courier service or (iv) actual receipt by the party to whom
such notice is required to be given. The addresses for such communications shall be with respect to the Holder of this Warrant or of Warrant Stock issued pursuant hereto, addressed to such Holder at its last known address or facsimile number
appearing on the books of the Issuer maintained for such purposes, with copies (which shall not constitute notice) to:

Kramer Levin
Naftalis & Frankel LLP

1177 Avenue of the Americas

New York, New York 10036

Attention: Christopher S. Auguste

Tel No.: (212) 715-9100

Fax No.:
(212) 715-8000

or with respect to the Issuer, addressed to:

FiberNet Telecom Group, Inc.

570 Lexington Avenue

New York, New York 10022

Attention:
President

Tel. No.: (212) 405-6200

Fax No.: (212) 421-8860

Any party hereto may from time to time change its address for notices by giving at least ten
(10) days written notice of such changed address to the other party hereto.

14. Warrant Agent. The Issuer may, by written
notice to each Holder of this Warrant, appoint an agent having an office in New York, New York for the purpose of issuing shares of Warrant Stock on the exercise of this Warrant pursuant to subsection (b) of Section 2 hereof, exchanging
this Warrant pursuant to subsection (d) of Section 2 hereof or replacing this Warrant pursuant to subsection (d) of Section 3 hereof, or any of the foregoing, and thereafter any such issuance, exchange or replacement, as the case
may be, shall be made at such office by such agent.

15. Remedies. The Issuer stipulates that the remedies at law of the Holder of
this Warrant in the event of any default or threatened default by the Issuer in the performance of or compliance with any of the terms of this Warrant are not and will not be adequate and that, to the fullest extent permitted by law, such terms may
be specifically enforced by a decree for the specific performance of any agreement contained herein or by an injunction against a violation of any of the terms hereof or otherwise.

16. Successors and Assigns. This Warrant and the rights evidenced hereby shall inure to the benefit of and be binding upon the successors and
assigns of the Issuer, the Holder hereof and (to the extent provided herein) the Holders of Warrant Stock issued pursuant hereto, and shall be enforceable by any such Holder or Holder of Warrant Stock.

17. Modification and Severability. If, in any action before any court or agency legally empowered to enforce any provision contained herein, any
provision hereof is found to be unenforceable, then such provision shall be deemed modified to the extent necessary to make it enforceable by such court or agency. If any such provision is not enforceable as set forth in the preceding sentence, the
unenforceability of such provision shall not affect the other provisions of this Warrant, but this Warrant shall be construed as if such unenforceable provision had never been contained herein.



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18. Headings. The headings of the Sections of this Warrant are for convenience of reference only
and shall not, for any purpose, be deemed a part of this Warrant.

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IN WITNESS WHEREOF, the Issuer has executed this Warrant as of the day and year first above written.



FIBERNET TELECOM GROUP, INC.By:Name:Title:




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EXERCISE FORM

FIBERNET TELECOM GROUP, INC.

The undersigned _______________, pursuant to the provisions of the within Warrant,
hereby elects to purchase _____ shares of Common Stock of FiberNet Telecom Group, Inc. covered by the within Warrant.



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|                         |  |  | 
|Dated: _________________ |  |  |  | Signature |  |        
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|                         |  |  |  |           |  | Address |  | 
|                         |  |  |  |           |  |         |  | 

Number of shares of Common Stock beneficially owned or deemed beneficially owned by the Holder on the date of
Exercise: ______ _________________________

ASSIGNMENT

FOR VALUE RECEIVED, _________________ hereby sells, assigns and transfers unto __________________ the within Warrant and all rights evidenced thereby and does irrevocably constitute and appoint _____________, attorney, to transfer the said
Warrant on the books of the within named corporation.



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|------------------------ |  |  |  | --------- |  | ------- |  | 
|                         |  |  | 
|Dated: _________________ |  |  |  | Signature |  |        
|                         |  |  |  |          
|                         |  |  |  |           |  | Address |  | 
|                         |  |  |  |           |  |         |  | 

PARTIAL ASSIGNMENT

FOR VALUE RECEIVED, _________________ hereby sells, assigns and transfers unto __________________ the right to purchase _________ shares of Warrant Stock evidenced by the within Warrant together with all rights
therein, and does irrevocably constitute and appoint ___________________, attorney, to transfer that part of the said Warrant on the books of the within named corporation.



|                         |  |  |  |           |  |         |  | 
|------------------------ |  |  |  | --------- |  | ------- |  | 
|                         |  |  | 
|Dated: _________________ |  |  |  | Signature |  |        
|                         |  |  |  |          
|                         |  |  |  |           |  | Address |  | 
|                         |  |  |  |           |  |         |  | 

FOR USE BY THE ISSUER ONLY:

This Warrant No. W-___ canceled (or transferred or exchanged) this _____ day of ___________, _____, shares of Common Stock issued therefor in the name of _______________, Warrant No. W-_____ issued for ____ shares of
Common Stock in the name of _______________.



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