X0202 4 2005-07-05 0 0001265888 NEUSTAR INC NSR 0001075598 WARBURG PINCUS EQUITY PARTNERS LP 0 0 1 0 0001322709 Warburg Pincus Partners LLC 466 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 0000929408 WARBURG PINCUS & CO 466 LEXINGTON AVENUE NEW YORK NY NY 100173147 0 0 1 0 0001162870 WARBURG PINCUS LLC 466 LEXINGTON AVENUE NEW YORK NY 10017 0 0 1 0 Class A Common Stock 2005-07-05 4 S 0 24112172 22.00 D 11174865 I By NeuStar, Inc. Voting Trust Class A Common Stock 5654080 D The stockholders are Warburg, Pincus Equity Partners, L.P., a Delaware limited partnership, including two affiliated partnerships ("WPEP"). Warburg Pincus Partners LLC, a New York limited liability company ("WP Partners"), which is a subsidiary of Warburg Pincus & Co., a New York general partnership ("WP") is the sole general partner of WPEP. Warburg Pincus LLC, a New York limited liability company, ("WP LLC," and together with WPEP, WP Partners and WP, the "Warburg Entities") manages WPEP. By reason of the provisions of Rule 16a-1 of the Securities Exchange Act of 1934, as amended, the Warburg Entities may be deemed to be the beneficial owners of the shares of Class A Common Stock. Each of WP Partners, WP LLC and WP disclaims beneficial ownership of all shares of Class A Common Stock owned by WPEP, except to the extent of any indirect pecuniary interest therein. The address of each Warburg Entity is 466 Lexington Avenue, New York, NY 10017 By: Warburg Pincus Partners LLC, its General Partner, By: Warburg Pincus & Co., its Managing Member, By: /s/ Scott A. Arenare 2005-07-06