Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
WARBURG PINCUS EQUITY PARTNERS LP
   2. Issuer Name and Ticker or Trading Symbol
NEUSTAR INC [NSR] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O WARBURG PINCUS & CO., 466 LEXINGTON AVENUE		 3. Date of Earliest Transaction (Month/Day/Year)
12/12/2005
(Street)

NEW YORK, NY 10017		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Class A Common Stock 12/12/2005   S   9,426,958 D $ 32.3 1,747,907 I (1) (2) By NeuStar, Inc. Voting Trust (1) (2)
Class A Common Stock               5,654,080 D (1) (2)  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Warrant to purchase Class A Common Stock $ 0.0667 12/12/2005   S     6,361,383 12/07/1999 12/07/2009 Class A Common Stock 6,361,383 $ 32.3 0 D (1) (2)  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
WARBURG PINCUS EQUITY PARTNERS LP
C/O WARBURG PINCUS & CO.
466 LEXINGTON AVENUE
NEW YORK, NY 10017		     X    
Warburg Pincus Partners LLC
466 LEXINGTON AVENUE
NEW YORK, NY 10017		     X    
WARBURG PINCUS & CO
466 LEXINGTON AVENUE
NEW YORK
NY, NY 100173147		     X    
WARBURG PINCUS LLC
466 LEXINGTON AVENUE
NEW YORK, NY 10017		     X    

Signatures

 By: Warburg, Pincus Partners, LLC, as General Partner, By: Warburg Pincus & Co., its Managing Member, By: /s/ Scott Arenare   12/12/2005
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) 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.
(2) 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. 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 extend of any indirect pecuniary interest therein. The address of each Warburg Entity is 466 Lexington Ave, New York, NY 10017.

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