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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1. Name and Address of Reporting Person * LANDY JOSEPH   2. Issuer Name and Ticker or Trading Symbol NEUSTAR INC [NSR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O WARBURG PINCUS LLC, 466 LEXINGTON AVE 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) _X_ Form filed by One Reporting Person ___ 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 I (1) (2) See footnotes (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

I (1) (2)

See footnotes (1) (2)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
LANDY JOSEPH C/O WARBURG PINCUS LLC 466 LEXINGTON AVE NEW YORK, NY 10017	X

Signatures

/s/ Scott A. Arenare, By: Scott Arenare, Attorney-in-Fact		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. The address of each Warburg Entity is 466 Lexington Avenue, New York, NY 10017.
(2)	Joseph Landy is a director of NeuStar, Inc., a Managing General Partner of WP and a Managing Member and Co-President of WP LLC. Mr. Landy'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, Joseph Landy may be deemed to be the beneficial owner of the shares of Class A Common Stock. Joseph Landy 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 any of the Warburg Entities, except to the extent of any indirect pecuniary interest therein.

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