<PAGE>

                               REGISTER.COM, INC.
                            STOCK ISSUANCE AGREEMENT


                  AGREEMENT made this 11th day of May 2001, to be effective as
of March 12, 2001 by and between Register.com, Inc., a Delaware corporation, and
Rene M. Mathis, a Participant in the Corporation's 2000 Stock Incentive Plan.

                  All capitalized terms in this Agreement shall have the meaning
assigned to them in this Agreement or in the attached Appendix.

         A. PURCHASE OF SHARES

                  1. Purchase. Participant hereby purchases 26,667 shares of
Common Stock (the "Purchased Shares") pursuant to the provisions of the Stock
Issuance Program at the purchase price of $0.0001 per share (the "Purchase
Price").

                  2. Payment. Concurrently with the delivery of this Agreement
to the Corporation, Participant shall pay the Purchase Price for the Purchased
Shares in cash or check payable to the Corporation and shall deliver a
duly-executed blank Assignment Separate from Certificate (in the form attached
hereto as Exhibit I) with respect to the Purchased Shares.

                  3. Stockholder Rights. Until such time as the Corporation
exercises the Repurchase Right, Participant (or any successor in interest) shall
have all the rights of a stockholder (including voting, dividend and liquidation
rights) with respect to the Purchased Shares, subject, however, to the transfer
restrictions of this Agreement.

                  4. Escrow. The Corporation shall have the right to hold the
Purchased Shares in escrow until those shares have vested in accordance with the
Vesting Schedule.

                  5. Compliance with Law. Under no circumstances shall shares of
Common Stock or other assets be issued or delivered to Participant pursuant to
the provisions of this Agreement unless, in the opinion of counsel for the
Corporation or its successors, there shall have been compliance with all
applicable requirements of Federal and state securities laws, all applicable
listing requirements of any stock exchange (or the Nasdaq National Market, if
applicable) on which the Common Stock is at the time listed for trading and all
other requirements of law or of any regulatory bodies having jurisdiction over
such issuance and delivery.

         B. TRANSFER RESTRICTIONS

                  1. Restriction on Transfer. Except for any Permitted Transfer,
Participant shall not transfer, assign, encumber or otherwise dispose of any of
the Purchased Shares which are subject to the Repurchase Right.

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                  2. Restrictive Legend. The stock certificate for the Purchased
Shares shall be endorsed with the following restrictive legend:

                           "The shares represented by this certificate are
         unvested and subject to certain repurchase rights granted to the
         Corporation and accordingly may not be sold, assigned, transferred,
         encumbered, or in any manner disposed of except in conformity with the
         terms of a written agreement dated May 11, 2001 between the Corporation
         and the registered holder of the shares (or the predecessor in interest
         to the shares). A copy of such agreement is maintained at the
         Corporation's principal corporate offices."

                  3. Transferee Obligations. Each person (other than the
Corporation) to whom the Purchased Shares are transferred by means of a
Permitted Transfer must, as a condition precedent to the validity of such
transfer, acknowledge in writing to the Corporation that such person is bound by
the provisions of this Agreement and that the transferred shares are subject to
the Repurchase Right to the same extent such shares would be so subject if
retained by Participant.

         C. REPURCHASE RIGHT

                  1. Grant. The Corporation is hereby granted the right (the
"Repurchase Right"), exercisable at any time during the ninety (90)-day period
following the date Participant ceases for any reason to remain in Service, to
repurchase at the Purchase Price all or any portion of the Purchased Shares in
which Participant is not, at the time of his or her cessation of Service, vested
in accordance with the Vesting Schedule or the provisions of Paragraph C.5 of
this Agreement (such shares to be hereinafter referred to as the "Unvested
Shares").

                  2. Exercise of the Repurchase Right. The Repurchase Right
shall be exercisable by written notice delivered to each Owner of the Unvested
Shares prior to the expiration of the ninety (90)-day exercise period. The
notice shall indicate the number of Unvested Shares to be repurchased and the
date on which the repurchase is to be effected, such date to be not more than
thirty (30) days after the date of such notice. The certificates representing
the Unvested Shares to be repurchased shall be delivered to the Corporation on
or before the close of business on the date specified for the repurchase.
Concurrently with the receipt of such stock certificates, the Corporation shall
pay to Owner, in cash or cash equivalent (including the cancellation of any
purchase-money indebtedness), an amount equal to the Purchase Price previously
paid for the Unvested Shares to be repurchased from Owner.

                  3. Termination of the Repurchase Right. The Repurchase Right
shall terminate with respect to any Unvested Shares for which it is not timely
exercised under Paragraph C.2. In addition, the Repurchase Right shall terminate
and cease to be exercisable with respect to any and all Purchased Shares in
which Participant vests in accordance with the following Vesting Schedule:

         The Participant will vest in 100% of the Purchased Shares on March 12,
2004.


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<PAGE>


         Vesting will cease on the date of Participant's cessation of Service;
provided, however, that if the Company terminates Participant's employment
without Cause, the Repurchase Right shall lapse with respect to the number of
Purchased Shares equal to the product of (A) 26,667 and (B) the ratio of the
number of full months of Service completed to 36.

                  4. Recapitalization. Any new, substituted or additional
securities or other property (including cash paid other than as a regular cash
dividend) which is by reason of any Recapitalization distributed with respect to
the Purchased Shares shall be immediately subject to the Repurchase Right and
any escrow requirements hereunder, but only to the extent the Purchased Shares
are at the time covered by such right or escrow requirements. Appropriate
adjustments to reflect such distribution shall be made to the number and/or
class of securities subject to this Agreement and to the price per share to be
paid upon the exercise of the Repurchase Right in order to reflect the effect of
any such Recapitalization upon the Corporation's capital structure; provided,
however, that the aggregate purchase price shall remain the same.

                  5. Change in Control.

                           (a) Immediately prior to the consummation of any
Change in Control, the Repurchase Right shall automatically lapse in its
entirety and the Purchased Shares shall vest in full, except to the extent the
Repurchase Right is assigned to the successor corporation (or parent thereof) or
otherwise continues in full force and effect pursuant to the terms of the Change
in Control.

                           (b) To the extent the Repurchase Right remains in
effect following a Change in Control, such right shall apply to the new capital
stock or other property (including any cash payments) received in exchange for
the Purchased Shares in consummation of the Change in Control, but only to the
extent the Purchased Shares are at the time covered by such right. Appropriate
adjustments shall be made to the price per share payable upon exercise of the
Repurchase Right to reflect the effect of the Change in Control upon the
Corporation's capital structure; provided, however, that the aggregate purchase
price shall remain the same. Any capital stock or other property (including cash
payments) issued or distributed with respect to the Purchased Shares may be held
in escrow.

                           (c) The Repurchase Right may also be subject to
termination in whole or in part on an accelerated basis, and the Purchased
Shares subject to immediate vesting, in accordance with the terms of any special
Addendum attached to this Agreement.

         D. SPECIAL TAX ELECTION

                  1. Section 83(b) Election. Under Code Section 83, the excess
of the fair market value of the Purchased Shares on the date any forfeiture
restrictions applicable to such shares lapse over the Purchase Price paid for
such shares will be reportable as ordinary income on the lapse date. For this
purpose, the term "forfeiture restrictions" includes the right of the
Corporation to repurchase the Purchased Shares pursuant to the Repurchase Right.
Participant may elect under Code Section 83(b) to be taxed at the time the
Purchased Shares are acquired,


                                       3
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rather than when and as such Purchased Shares cease to be subject to such
forfeiture restrictions. Such election must be filed with the Internal Revenue
Service within thirty (30) days after the date of this Agreement. Even if the
fair market value of the Purchased Shares on the date of this Agreement equals
the Purchase Price paid (and thus no tax is payable), the election must be made
to avoid adverse tax consequences in the future. THE FORM FOR MAKING THIS
ELECTION IS ATTACHED AS EXHIBIT II HERETO. PARTICIPANT UNDERSTANDS THAT FAILURE
TO MAKE THIS FILING WITHIN THE APPLICABLE THIRTY (30)-DAY PERIOD WILL RESULT IN
THE RECOGNITION OF ORDINARY INCOME AS THE FORFEITURE RESTRICTIONS LAPSE.

                  2. FILING RESPONSIBILITY. PARTICIPANT ACKNOWLEDGES THAT IT IS
PARTICIPANT'S SOLE RESPONSIBILITY, AND NOT THE CORPORATION'S, TO FILE A TIMELY
ELECTION UNDER CODE SECTION 83(b), EVEN IF PARTICIPANT REQUESTS THE CORPORATION
OR ITS REPRESENTATIVES TO MAKE THIS FILING ON HIS OR HER BEHALF.

         E. GENERAL PROVISIONS

                  1. Assignment. The Corporation may assign the Repurchase Right
to any person or entity selected by the Board, including (without limitation)
one or more stockholders of the Corporation.

                  2. No Employment or Service Contract. Nothing in this
Agreement or in the Plan shall confer upon Participant any right to continue in
Service for any period of specific duration or interfere with or otherwise
restrict in any way the rights of the Corporation (or any Parent or Subsidiary
employing or retaining Participant) or of Participant, which rights are hereby
expressly reserved by each, to terminate Participant's Service at any time for
any reason, with or without cause.

                  3. Notices. Any notice required to be given under this
Agreement shall be in writing and shall be deemed effective upon personal
delivery or upon deposit in the U.S. mail, registered or certified, postage
prepaid and properly addressed to the party entitled to such notice at the
address indicated below such party's signature line on this Agreement or at such
other address as such party may designate by ten (10) days advance written
notice under this paragraph to all other parties to this Agreement.

                  4. No Waiver. The failure of the Corporation in any instance
to exercise the Repurchase Right shall not constitute a waiver of any other
repurchase rights that may subsequently arise under the provisions of this
Agreement or any other agreement between the Corporation and Participant. No
waiver of any breach or condition of this Agreement shall be deemed to be a
waiver of any other or subsequent breach or condition, whether of like or
different nature.

                  5. Cancellation of Shares. If the Corporation shall make
available, at the time and place and in the amount and form provided in this
Agreement, the consideration for the Purchased Shares to be repurchased in
accordance with the provisions of this Agreement, then


                                       4
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from and after such time, the person from whom such shares are to be repurchased
shall no longer have any rights as a holder of such shares (other than the right
to receive payment of such consideration in accordance with this Agreement).
Such shares shall be deemed purchased in accordance with the applicable
provisions hereof, and the Corporation shall be deemed the owner and holder of
such shares, whether or not the certificates therefor have been delivered as
required by this Agreement.

                  6. Participant Undertaking. Participant hereby agrees to take
whatever additional action and execute whatever additional documents the
Corporation may deem necessary or advisable in order to carry out or effect one
or more of the obligations or restrictions imposed on either Participant or the
Purchased Shares pursuant to the provisions of this Agreement.

                  7. Agreement is Entire Contract. This Agreement constitutes
the entire contract between the parties hereto with regard to the subject matter
hereof. This Agreement is made pursuant to the provisions of the Plan and shall
in all respects be construed in conformity with the terms of the Plan.

                  8. Governing Law. This Agreement shall be governed by, and
construed in accordance with, the laws of the State of New York without resort
to that State's conflict-of-laws rules.

                  9. Successors and Assigns. The provisions of this Agreement
shall inure to the benefit of, and be binding upon, the Corporation and its
successors and assigns and upon Participant, Participant's assigns and the legal
representatives, heirs and legatees of Participant's estate, whether or not any
such person shall have become a party to this Agreement and have agreed in
writing to join herein and be bound by the terms hereof.


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<PAGE>


                  IN WITNESS WHEREOF, the parties have executed this Agreement
on the day and year first indicated above.



                               REGISTER.COM, INC.


                               By:        /s/ Richard D. Forman
                                          --------------------------------------

                               Title:     President, Chief Executive Officer and
                                          Chairman of the Board of Directors
                                          --------------------------------------

                               Address:   585 Eighth Avenue, 11th Floor
                                          --------------------------------------
                                          New York, NY 10018
                                          --------------------------------------



                                          /s/Rene M. Mathis
                                          --------------------------------------
                                          PARTICIPANT

                               Address:
                                          --------------------------------------

                                          --------------------------------------





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                                    EXHIBIT I

                      ASSIGNMENT SEPARATE FROM CERTIFICATE



                  FOR VALUE RECEIVED _____________________ hereby sell(s),
assign(s) and transfer(s) unto Register.com, Inc. (the "Corporation"),
________________(____) shares of the Common Stock of the Corporation standing in
his or her name on the books of the Corporation represented by Certificate No.
_____________ herewith and do(es) hereby irrevocably constitute and appoint
________________________ Attorney to transfer the said stock on the books of the
Corporation with full power of substitution in the premises.

Dated:  _____________________


                                         Signature
                                                  ------------------------------









Instruction: Please do not fill in any blanks other than the signature line.
Please sign exactly as you would like your name to appear on the issued stock
certificate. The purpose of this assignment is to enable the Corporation to
exercise the Repurchase Right without requiring additional signatures on the
part of Participant.

<PAGE>


                                   EXHIBIT II

                           SECTION 83(b) TAX ELECTION


This statement is being made under Section 83(b) of the Internal Revenue Code,
pursuant to Treas. Reg. Section 1.83-2.

(1)      The taxpayer who performed the services is:

         Name:
         Address:
         Taxpayer Ident. No.:

(2)      The property with respect to which the election is being made is
         _________ shares of the common stock of Register.com, Inc.

(3)      The property was issued on _______________________.

(4)      The taxable year in which the election is being made is the calendar
         year ________.

(5)      The property is subject to a repurchase right pursuant to which the
         issuer has the right to acquire the property at the original purchase
         price if for any reason taxpayer's employment with the issuer is
         terminated. The issuer's repurchase right lapses in a series of
         installments over a four (4)-year period ending on
         ____________________________.

(6)      The fair market value at the time of transfer (determined without
         regard to any restriction other than a restriction which by its terms
         will never lapse) is $_____________ per share.

(7)      The amount paid for such property is $_______________ per share.

(8)      A copy of this statement was furnished to Register.com, Inc. for whom
         taxpayer rendered the services underlying the transfer of property.

(9)      This statement is executed on ______________________________.



------------------------------------        ------------------------------------
Spouse (if any)                             Taxpayer


This election must be filed with the Internal Revenue Service Center with which
taxpayer files his or her Federal income tax returns and must be made within
thirty (30) days after the execution date of the Stock Issuance Agreement. This
filing should be made by registered or certified mail, return receipt requested.
Participant must retain two (2) copies of the completed form for filing with his
or her Federal and state tax returns for the current tax year and an additional
copy for his or her records.

<PAGE>

                                    APPENDIX


                  The following definitions shall be in effect under the
Agreement:

         A. Agreement shall mean this Stock Issuance Agreement.

         B. Board shall mean the Corporation's Board of Directors.

         C. Cause shall mean (i) Participant's breach of the terms of his
employment or proprietary information agreement; (ii) Participant's commission
of any felony or any crime involving moral turpitude; (iii) Participant's breach
of a fiduciary duty or material policy of the Company; (iv) Participant's
commission of a dishonest act or common law fraud against the Company; (v) gross
negligence or willful misconduct in connection with Participant's position, (vi)
Participant's continual failure or refusal to perform any duties reasonably
required in the course of his employment; (vii) Participant's refusal to take or
fail to satisfactorily to complete any screening test for illegal drugs and
controlled substances that may be administered; or (viii) Participant's
engagement in misconduct in bad faith which is materially injurious to the
Company.

         D. Change in Control shall mean a change in ownership or control of the
Corporation effected through any of the following transactions:

                           (i) a merger, consolidation or reorganization
         approved by the Corporation's stockholders, unless securities
         representing more than fifty percent (50%) of the total combined voting
         power of the voting securities of the successor corporation are
         immediately thereafter beneficially owned, directly or indirectly and
         in substantially the same proportion, by the persons who beneficially
         owned the Corporation's outstanding voting securities immediately prior
         to such transaction.

                           (ii) any stockholder-approved transfer or other
         disposition of all or substantially all of the Corporation's assets, or

                           (iii) the acquisition, directly or indirectly by any
         person or related group of persons (other than the Corporation or a
         person that directly or indirectly controls, is controlled by, or is
         under common control with, the Corporation), of beneficial ownership
         (within the meaning of Rule 13d-3 of the 1934 Act) of securities
         possessing more than fifty percent (50%) of the total combined voting
         power of the Corporation's outstanding securities pursuant to a tender
         or exchange offer made directly to the Corporation's stockholders which
         the Board recommends such stockholders to accept.

         E. Code shall mean the Internal Revenue Code of 1986, as amended.

         F. Common Stock shall mean the Corporation's common stock.


                                      A-1.
<PAGE>


         G. Corporation shall mean Register.com, Inc., a Delaware corporation.

         H. Owner shall mean Participant and all subsequent holders of the
Purchased Shares who derive their chain of ownership through a Permitted
Transfer from Participant.

         I. Parent shall mean any corporation (other than the Corporation) in an
unbroken chain of corporations ending with the Corporation, provided each
corporation in the unbroken chain (other than the Corporation) owns, at the time
of the determination, stock possessing fifty percent (50%) or more of the total
combined voting power of all classes of stock in one of the other corporations
in such chain.

         J. Participant shall mean the person to whom the Purchased Shares are
issued under the Stock Issuance Program.

         K. Permitted Transfer shall mean (i) a gratuitous transfer of the
Purchased Shares, provided and only if Participant obtains the Corporation's
prior written consent to such transfer, (ii) a transfer of title to the
Purchased Shares effected pursuant to Participant's will or the laws of
intestate succession following Participant's death or (iii) a transfer to the
Corporation in pledge as security for any purchase-money indebtedness incurred
by Participant in connection with the acquisition of the Purchased Shares.

         L. Plan shall mean the Corporation's 2000 Stock Incentive Plan.

         M. Plan Administrator shall mean either the Board or a committee of the
Board acting in its administrative capacity under the Plan.

         N. Purchase Price shall have the meaning assigned to such term in
Paragraph A.1.

         O. Purchased Shares shall have the meaning assigned to such term in
Paragraph A.1.

         P. Recapitalization shall mean any stock split, stock dividend,
recapitalization, combination of shares, exchange of shares or other change
affecting the Corporation's outstanding Common Stock as a class without the
Corporation's receipt of consideration.

         Q. Repurchase Right shall mean the right granted to the Corporation in
accordance with Article C.

         R. Service shall mean the Participant's performance of services for the
Corporation (or any Parent or Subsidiary) in the capacity of an employee,
subject to the control and direction of the employer entity as to both the work
to be performed and the manner and method of performance, a non-employee member
of the board of directors or a consultant.

         S. Stock Issuance Program shall mean the Stock Issuance Program under
the Plan.

         T. Subsidiary shall mean any corporation (other than the Corporation)
in an unbroken chain of corporations beginning with the Corporation, provided
each corporation (other


                                      A-2.
<PAGE>


than the last corporation) in the unbroken chain owns, at the time of the
determination, stock possessing fifty percent (50%) or more of the total
combined voting power of all classes of stock in one of the other corporations
in such chain.

         U. Vesting Schedule shall mean the vesting schedule specified in
Paragraph C.3, subject to acceleration (if any) in connection with a Change in
Control.

         V. Unvested Shares shall have the meaning assigned to such term in
Paragraph C.1.





                                      A-3.