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 * ROSTOV DAVID   2. Issuer Name and Ticker or Trading Symbol INFOSPACE INC [INSP] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chief Financial Officer (Last) (First) (Middle) 601 108TH AVENUE NE, SUITE 1200 3. Date of Earliest Transaction (Month/Day/Year) 04/03/2006 (Street) BELLEVUE, WA 98004 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 Common Stock 04/03/2006   M(1)   30,000 A $ 11.329 30,000 D   Common Stock 04/03/2006   S(1)   336 D $ 27.66 29,664 D   Common Stock 04/03/2006   S(1)   4,928 D $ 27.689 24,736 D   Common Stock 04/03/2006   S(1)   1,417 D $ 27.75 23,319 D   Common Stock 04/03/2006   S(1)   4,736 D $ 27.7934 18,583 D   Common Stock 04/03/2006   S(1)   2,234 D $ 27.8059 16,349 D   Common Stock 04/03/2006   S(1)   1,421 D $ 28 14,928 D   Common Stock 04/03/2006   S(1)   14,928 D $ 28.0158 0 D

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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 (Right to Buy)

$ 11.329

04/03/2006

M(1)

30,000

(2)

04/02/2010

Common Stock

30,000

$ 0

80,000

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
ROSTOV DAVID 601 108TH AVENUE NE, SUITE 1200 BELLEVUE, WA 98004			Chief Financial Officer

Signatures

/s/ Rostov, David		04/03/2006
**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)	The exercise of the stock option and the sale of Common Stock reported on this form were made pursuant to a plan previously adopted by Mr. Rostov, which plan was intended to comply with Rule 10b5-1(c) under the Securities Exchange Act of 1934, as amended.
(2)	The option became exercisable as to 25% of the original grant of 150,000 shares on April 2, 2004 and vests as to 2.08333% of the shares on a monthly basis thereafter, being fully vested and exercisable on April 2, 2007.

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