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. The
     address of each Warburg Entity is 466 Lexington Avenue, New York, NY 10017.
     Henry Kressel is a director of NeuStar, Inc., and a Managing Member of WP
     LLC. Mr. Kressel's business address is c/o Warburg Pincus, 466 Lexington
     Avenue, New York, NY 10017. By reason of the provisions of Rule 16a-1 of
     the Securities Exchange Act of 1934, as amended, Henry Kressel may be
     deemed to be the beneficial owner of the Warrants and shares of Class A
     Common Stock owned by WPEP. Henry Kressel disclaims beneficial ownership of
     any of the Shares owned of record by any of the Warburg Entities, except to
     the extent of any indirect pecuniary interest therein.