Sec Form 4 Filing - THOMAS ROBERT D @ INFOBLOX INC - 2013-02-26

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 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 THOMAS ROBERT D 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 X __ Officer (give title below) _____ Other (specify below) President and CEO (Last) (First) (Middle) C/O INFOBLOX INC., 4750 PATRICK HENRY DR. 3. Date of Earliest Transaction (MM/DD/YY) 02/26/2013 (Street) SANTA CLARA, CA95054 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 02/26/2013 A 113,000 A $ 0 888,833 D Common Stock 02/26/2013 M 80,059 A $ 4.53 968,892 D Common Stock 02/26/2013 M 5,781 A $ 1.68 974,673 D Common Stock 02/26/2013 S 85,840 D $ 21.73 888,833 ( 1 ) ( 2 ) D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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 Indir ect (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)(ISO) $ 1.68 02/26/2013 M 5,781 ( 3 ) 12/14/2016 Common Stock 5,781 $ 0 0 D Employee Stock Option (right to buy)(NQ) $ 4.53 02/26/2013 M 80,059 ( 4 ) 02/29/2020 Common Stock 80,059 $ 0 616,949 D Employee Stock Option (right to buy)(NQ) $ 21.45 02/26/2013 A 75,000 ( 5 ) 02/25/2023 Common Stock 75,000 $ 0 75,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other THOMAS ROBERT D C/O INFOBLOX INC. 4750 PATRICK HENRY DR. SANTA CLARA, CA95054 X President and CEO Signatures Robert Thomas, by Robert Horton, his Attorney-in-Fact 02/28/2013 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Total includes 113,000 Restricted Stock Units granted February 26, 2013 that vest 25% on the one year anniversary of the grant and 12.5% each six months thereafter. ( 2 )Amount shown is after giving effect to the transfer of 775,833 shares of Infoblox Inc. common stock and employee stock options to purchase 247,066 shares of Infoblox Inc. common stock to his ex-spouse pursuant to a domestic relations order. The reporting person no longer reports as beneficially owned any securities owned by his ex-spouse. ( 3 )The option was fully vested and exercisable as of October 1, 2010. ( 4 )The option vested and was exercisable as to 25% of the total grant amount on March 1, 2011 and the remaining shares underlying the option vest 2.0833% monthly thereafter. ( 5 )The option vests and is exercisable as to 25% of the total grant amount on February 26, 2014 and the remaining shares underlying the option vest 2.0833% monthly thereafter.

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* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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