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 * MARSHALL FRANK   2. Issuer Name and Ticker or Trading Symbol INFOBLOX INC [BLOX] 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 INFOBLOX INC., 4750 PATRICK HENRY DR 3. Date of Earliest Transaction (Month/Day/Year) 04/25/2012 (Street) SANTA CLARA, CA 95054 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 04/25/2012   C   2,766 A (1) 12,766 I By trust (2) Common Stock 04/25/2012   C   14,727 A (1) 14,727 I By Big Basin Partners LP (3) Common Stock 04/25/2012   C   38,362 A (4) 53,089 I By Big Basin Partners LP (3)

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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

Series D Convertible Preferred Stock

(1)

04/25/2012

C

8,298 (1)

(1)

(1)

Common Stock

2,766

$ 0

0

I

By trust (2)

Series D Convertible Preferred Stock

(1)

04/25/2012

C

44,183 (1)

(1)

(1)

Common Stock

14,727

$ 0

0

I

By Big Basin Partners LP (3)

Series E Convertible Preferred Stock

(4)

04/25/2012

C

115,088 (4)

(4)

(4)

Common Stock

38,362

$ 0

0

I

By Big Basin Partners LP (3)

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
MARSHALL FRANK C/O INFOBLOX INC. 4750 PATRICK HENRY DR SANTA CLARA, CA 95054	X

Signatures

/s/ Robert Horton as attorney-in-fact for Frank J. Marshall		04/27/2012
**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)	Each share of the issuer's Series D Convertible Preferred Stock automatically converted into 1/3 share of the issuer's Common Stock on April 25, 2012 pursuant to an election by the holders of a majority of the shares of preferred stock of the issuer in connection with the closing of the issuer's sale of its Common Stock in an initial firm commitment underwritten public offering pursuant to its registration statement on Form S-1 under the Securities Act of 1933, as amended, and had no expiration date.
(2)	Shares held of record by the Frank and Judith Marshall Living Trust, of which Mr. Marshall serves as trustee.
(3)	Share held of record by Big Basin Partners LP, of which the reporting person serves as a General Partner. The reporting person disclaims beneficial ownership of such securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.
(4)	Each share of the issuer's Series E Convertible Preferred Stock automatically converted into 1/3 share of the issuer's Common Stock on April 25, 2012 pursuant to an election by the holders of a majority of the shares of preferred stock of the issuer in connection with the closing of the issuer's sale of its Common Stock in an initial firm commitment underwritten public offering pursuant to its registration statement on Form S-1 under the Securities Act of 1933, as amended, and had no expiration date.

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