Schedule 99.1
                                                                   -------------

Explanation of Responses
------------------------

(1)  This Form 3 pertains to the simultaneous execution and effectiveness of
     NeuStar, Inc.'s Registration Statement on Form S-1, filed with the
     Securities and Exchange Commission on March 29, 2005, as amended.

(2)  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.