Document:

EXHIBIT 4.10

                     WARRANT AGREEMENT AMENDMENT AND WAIVER

                  This AMENDMENT TO WARRANT  AGREEMENT AND WAIVER is dated as of
March 30, 2000 ("AGREEMENT"),  by and between PATHNET,  INC. (the "Company"),  a
Delaware  corporation,  and THE  BANK  OF NEW  YORK,  warrant  agent  (with  any
successor warrant agent, the "WARRANT AGENT").

                  WHEREAS,  the Company  proposes to enter into a reorganization
involving the Company, Pathnet Telecommunications, Inc. ("Pathnet Telecom"), the
existing  shareholders  of Company,  and certain  proposed new  shareholders  of
Pathnet Telecom (the "Reorganization").

                  WHEREAS, in conjunction with the  Reorganization,  the Company
and the  Warrant  Agent  desire to amend the  Warrant  Agreement  (the  "Warrant
Agreement")  dated as April 8, 1998 by and  between  the Company and the Warrant
Agent pursuant to the terms of this Agreement.

                  WHEREAS, in conjunction with the  Reorganization,  the Company
and the  Warrant  Agent  desire  to  waive  certain  provisions  of the  Warrant
Agreement as set out in this Agreement.

                  WHEREAS,  Section 7.01 of the Warrant Agreement  provides that
the Company and the Warrant  Agent may amend the terms of the Warrant  Agreement
and the  Warrants,  and  waivers  to  departures  from the terms of the  Warrant
Agreement and Warrants may be given,  with the consent of the Requisite  Warrant
Holders (as defined in the Warrant Agreement).

                  WHEREAS,  the Requisite  Warrant Holders have consented to the
proposed amendments to and waivers of the Warrant Agreement.

                  NOW, THEREFORE, the parties hereto agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

                  SECTION  1.01.  Capitalized  terms used herein and not defined
herein shall have the meanings ascribed to such terms in the Warrant Agreement.

                                   ARTICLE II
                                   AMENDMENTS

                  SECTION 2.01. Effective as of the date hereof, Section 5.01(d)
of the Warrant  Agreement shall be amended by inserting,  immediately  after the
phrase, "(a "Fundamental Transaction")," in the sixth line, the following words:
"(it  being   understood  that  a  single   transaction  or  series  of  related
transactions  pursuant  to  which  not  less  than  ninety-five  percent  of the
outstanding shares of capital stock of the Company are exchanged for shares in a
single Affiliate (or any Person who, pursuant to such  transaction,  will become
such an  Affiliate)  shall be deemed to be a  Fundamental  Transaction,  and the
Affiliate acquiring such shares shall, for purposes of this clause, be deemed to
be the Surviving Person (as defined below)),".

                  SECTION   2.02.   Subject  to,  and   effective   as  of,  the
consummation  of the  Reorganization,  the date "April 8, 2000" shall be deleted
where it appears in the  definition  of "Exercise  Event" in Section 2.01 of the
Warrant  Agreement,  and from the two places where it appears in Exhibit A (Form
of Warrant  Certificate)  to the Warrant  Agreement and in each place where such
date is deleted the date "April 30, 2001" shall be inserted.

                                   ARTICLE III
                                     WAIVERS

 .........         SECTION  3.01. The Company and the Warrant  Agent hereby waive
the  provisions  of  Section  2.02(a)  of the  Warrant  Agreement  such that the
consummation of the Reorganization  will not be deemed to constitute a Change of
Control nor an Exercise Event for the purposes of the Warrant Agreement.

                                   ARTICLE IV
                                  MISCELLANEOUS

                  SECTION  4.01.   This  Agreement  shall  be  governed  by  and
construed in accordance with the laws of the state of New York.

                  SECTION 4.02.  This Agreement may be executed in any number of
counterparts,  each of which so executed shall be deemed to be an original;  but
such counterparts shall together constitute but one and the same instrument.

                  SECTION  4.03.  A copy of this  Agreement  shall be  available
during  regular  business hours at the principal  corporate  trust office of the
Warrant  Agent,  for  inspection by the holder of any Warrant  Certificate.  The
Warrant  Agent may require  such holder to submit his  Warrant  Certificate  for
inspection by it.

                  SECTION  4.04.  Except as expressly  amended or waived by this
Agreement,  the Warrant Agreement shall continue unchanged and in full force and
effect.

<PAGE>

                  IN WITNESS  WHEREOF,  this Agreement has been duly executed by
the parties hereto as of the day and year first above written.

                               PATHNET, INC.

                               By:/s/ W.R. Smedberg V
                                  ---------------------------------------
                                  Name:
                                  Title:

                               THE BANK OF NEW YORK,
                                  Warrant Agent

                                By: /s/ Terence Rawlins
                                   ---------------------------------------
                                   Name:     Terence Rawlins
                                   Title:    Assistant Vice PresidentEXHIBIT 4.11

                  WARRANT REGISTRATION RIGHTS AGREEMENT WAIVER

                  This WAIVER is dated as of March 30, 2000  ("WAIVER"),  and is
made by PATHNET, INC. (the "Company"), a Delaware corporation,  with the consent
of Spectrum  Equity  Investors,  L.P.,  New  Enterprise  Associates  VI, Limited
Partnership,  Onset  Enterprise  Associates  II, L.P.,  FBR  Technology  Venture
Partners,  L.P., Toronto Dominion Capital (USA) Inc., Grotech Partners IV, L.P.,
Richard A. Jalkut and David Schaeffer (the "Permitted Holders").

                  WHEREAS,  the holders of the warrants  expiring April 15, 2008
(the  "Warrants")  of the  Company  are  entitled  to the  benefits of a Warrant
Registration Rights Agreement (the "Registration  Rights Agreement") dated as of
April 8, 1998  between  the  Company,  the  Permitted  Holders  and the  Initial
Purchasers (as defined therein).

                  WHEREAS,  the Company  proposes to enter into a reorganization
involving the Company, Pathnet Telecommunications, Inc. ("Pathnet Telecom"), the
existing  shareholders  of Company,  and certain  proposed new  shareholders  of
Pathnet Telecom (the "Regoranization").

                  WHEREAS, in conjunction with the  Reorganization,  the Company
desires to waive certain provisions of the Registration Rights Agreement, as set
out in this Waiver.

                  WHEREAS,  Section 6(d) of the  Registration  Rights  Agreement
provides that waivers or consents to departures from the provisions  thereof may
be made with the prior  written  consent  of (i) the  holders of not less than a
majority  of the  outstanding  Warrants,  and  (ii)  with  respect  to  Sections
affecting  the rights or  obligations  of the Permitted  Holders,  the Permitted
Holders who hold not less than a majority of shares of the capital stock held by
the Permitted Holders.

                  WHEREAS, the holders of a majority of the outstanding Warrants
have  consented to the proposed  waiver of the  provisions  of the  Registration
Rights Agreement as set out in this Waiver.

                  WHEREAS,  by  signing  this  Waiver  or any copy  hereof,  the
Permitted  Holders  have  provided  their  written  consent to the waiver of the
provisions of the Registration Rights Agreement as set out in this Waiver.

                                                      WAIVER

                  The Company hereby waives the provisions of Section 3.2 of the
Registration  Rights Agreement such that the consummation of the  Reorganization
shall not be deemed to constitute a Change of Control and shall not give rise to
any  Tag-Along  Right  (as each  such  term in  defined  in  Section  3.2 of the
Registration Rights Agreement).

                                  PATHNET, INC.

                                  By:   /s/ W. R. Smedberg V
                                     ------------------------------------
                                     Name:
                                     Title:

We  hereby  consent  to the  waiver  of the  provisions  of  Section  3.2 of the
Registration Rights Agreement as set out above:

                                  SPECTRUM EQUITY INVESTORS, L.P.,
                                  In its Capacity as a Permitted Holder

                                  By:/s/ Chris J. Maroni
                                  ------------------------------------------
                                     Name:   K. J. Maroni
                                     Title:  illegible

                                  NEW ENTERPRISE ASSOCIATES VI, Limited
                                   Partnership,
                                   In its Capacity as a Permitted Holder

                                  By:   /s/ illegible
                                  ------------------------------------------
                                  Name:
                                  Title:

                                  ONSET ENTERPRISE ASSOCIATES II, L.P.,
                                   In its Capacity as a Permitted Holder
                                  By:

                                  By: /s/ R Kuhling
                                  ------------------------------------------
                                  Name:
                                  Title:  illegible
                                          OEA II Management
                                          The General Partner of
                                          Onset Enterprise Associates II, L.P.,

                                  FBR TECHNOLOGY VENTURE PARTNERS, L.P.,
                                  In its Capacity as a Permitted Holder

                                  By: /s/ illegible
                                  ------------------------------------------
                                  Name:
                                  Title:

                                  TORONTO DOMINION CAPITAL (USA) INC.,
                                  In its Capacity as a Permitted Holder

                                  By: /s/ illegible
                                  ------------------------------------------
                                  Name: Stephen A. Reistedter
                                  Title: Vice President and Director

                                  GROTECH PARTNERS IV, L.P.,
                                  In its Capacity as a Permitted Holder

                                  By: /s/ Patrick J. Kerins
                                  ------------------------------------------
                                  Name:  Patrick J. Kerins
                                  Title:  Managing Director

                                   /s/ Richard A. Jalkut
                                  ------------------------------------------
                                  Richard A. Jalkut

                                  ------------------------------------------
                                  David Schaeffer

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