X0201 4 2003-09-18 0 0001085866 DSL NET INC DSLN 0001263748 COLUMBIA CAPITAL III LLC 210 N. UNION STREET SUITE 300 ALEXANDRIA VA 22314 0 0 1 0 Common Stock 2003-09-18 4 S 0 38968 .7642 D 71314 I See footnote Common Stock 2003-09-19 4 S 0 12989 .7511 D 58325 I See footnote Common Stock 2003-09-22 4 S 0 7879 .73 D 50446 I See footnote Common Stock 2003-09-18 4 S 0 704720 .7642 D 1289673 I See footnote Common Stock 2003-09-19 4 S 0 234907 .7511 D 1054766 I See footnote Common Stock 2003-09-22 4 S 0 142494 .73 D 912272 I See Footnote Common Stock 2003-09-18 4 S 0 565313 .7642 D 1034550 I See footnote Common Stock 2003-09-19 4 S 0 188438 .7511 D 846112 I See Footnote Common Stock 2003-09-22 4 S 0 144306 .73 D 731806 I See footnote The securities are held directly by Columbia Capital Equity Partners III (AI), L.P. ("Columbia AI"). The Reporting Person is the general partner of Columbia Capital Equity Partners III, L.P. which is the general partner of Columbia AI and disclaims beneficial ownership of the securities except to the extent of its pecuniary interest therein. The securities are held directly by Columbia Capital Equity Partners III (QP), L.P. ("Columbia QP"). The Reporting Person is the general partner of Columbia Capital Equity Partners III, L.P. which is the general partner of Columbia QP and disclaims beneficial ownership of the securities except to the extent of its pecuniary interest therein. The securities are held directly by Columbia Broadslate Partners, LLC ("Broadslate"). The Reporting Person is the Manager of Broadslate and disclaims beneficial ownership of the securities except to the extent of its pecuniary interest therein. /s/ Donald A. Doering, CFO of the Reporting Person 2003-09-22