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 * FOSTER MARK D   2. Issuer Name and Ticker or Trading Symbol NEUSTAR INC [NSR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Sr. VP & Chief Tech. Off. (Last) (First) (Middle) 46000 CENTER OAK PLAZA 3. Date of Earliest Transaction (Month/Day/Year) 04/03/2006 (Street) STERLING, VA 20166 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 04/03/2006   M   7,270 A $ 6.429 8,970 (1) (2) D   Class A Common Stock 04/03/2006   M   27,808 A $ 4.286 36,778 (2) D   Class A Common Stock 04/03/2006   S   800 D $ 29.85 35,978 (2) D   Class A Common Stock 04/03/2006   S   3,600 D $ 29.98 32,378 (2) D   Class A Common Stock 04/03/2006   S   2,200 D $ 30 30,178 (2) D   Class A Common Stock 04/03/2006   S   578 D $ 30.05 29,600 (2) D   Class A Common Stock 04/03/2006   S   300 D $ 30.04 29,300 (2) D   Class A Common Stock 04/03/2006   S   10,100 D $ 30.03 19,200 (2) D   Class A Common Stock 04/03/2006   S   100 D $ 30.1 19,100 (2) D   Class A Common Stock 04/03/2006   S   500 D $ 29.96 18,600 (2) D   Class A Common Stock 04/03/2006   S   600 D $ 29.97 18,000 (2) D   Class A Common Stock 04/03/2006   S   3,300 D $ 29.98 14,700 (2) D   Class A Common Stock 04/03/2006   S   3,800 D $ 29.99 10,900 (2) D   Class A Common Stock 04/03/2006   S   7,500 D $ 30 3,400 (2) D   Class A Common Stock 04/03/2006   S   1,500 D $ 30.01 1,900 (2) D   Class A Common Stock 04/03/2006   S   200 D $ 30.06 1,700 (2) D   Class A Common Stock 04/03/2006   S   1,604 D $ 30.45 56,489 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   200 D $ 30.14 56,289 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   400 D $ 30.2 55,889 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   400 D $ 30.16 55,489 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   700 D $ 30.22 54,789 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   1,300 D $ 30.21 53,489 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   300 D $ 30.19 53,189 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   700 D $ 30.15 52,489 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   1,200 D $ 30.1 51,289 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   800 D $ 30.01 50,489 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   3,600 D $ 29.95 46,889 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   200 D $ 29.79 46,689 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   1,100 D $ 29.76 45,589 I By NeuStar, Inc. Voting Trust Class A Common Stock 04/03/2006   S   200 D $ 29.77 45,389 I By NeuStar, Inc. Voting Trust

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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

Employee Stock Option

$ 6.429

04/03/2006

M

7,270

(3)

12/18/2013

Class A Common Stock

7,270

$ 0

62,729

D

Employee Stock Option

$ 4.286

04/03/2006

M

27,808

(4)

06/06/2012

Class A Common Stock

27,808

$ 0

19,791

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
FOSTER MARK D 46000 CENTER OAK PLAZA STERLING, VA 20166			Sr. VP & Chief Tech. Off.

Signatures

/s/ Martin Lowen, by power of attorney		04/04/2006
**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)	Excludes the 33,607 shares of Class A Common Stock held by a family trust, which were previously reported incorrectly as being owned directly by the Reporting Person.
(2)	Includes 1,700 shares that are subject to a restricted stock agreement under the NeuStar, Inc. 2005 Stock Incentive Plan, which provides that twenty-five percent of the shares vest on each of February 22, 2007, 2008, 2009 and 2010.
(3)	24,228 options are immediately exercisable with the remaining options vesting in monthly installments through December 2008.
(4)	Immediately.
Remarks: Form 4 Filing 1 of 2 (continuation report):  Related transactions effected by the Reporting Person on April 3, 2006 are reported on additional Forms 4. *** All of the sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person. ***

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