BLOX Infoblox Inc.

EXPLANATORY NOTE

DEREGISTRATION OF SECURITIES

This Post-Effective Amendment No. 1 relates to the registration statement on Form S-8 (Registration No. 333-180840) previously filed by Infoblox Inc., a Delaware corporation (the “Company”), with the U.S. Securities and Exchange Commission (the “SEC”) on April 20, 2012 (the “Registration Statement”), pertaining to the registration of 18,201,236 shares of common stock, par value $0.0001 per share, of the Company (the “Shares”) under the Registrant’s 2012 Equity Incentive Plan, 2012 Employee Stock Purchase Plan, Amended and Restated 2005 Stock Plan, 2003 Stock Plan and 2000 Stock Option Plan.

On September 16, 2016, the Company entered into an Agreement and Plan of Merger with Delta Holdco, LLC, a Delaware limited liability company (“Parent”), and India Merger Sub, Inc., a Delaware corporation and a wholly owned subsidiary of Parent (“Purchaser”), providing for, among other things, the merger of Purchaser with and into the Company with the Company becoming a wholly owned subsidiary of Parent (the “Merger”) pursuant to Section 251(h) of the Delaware General Corporation Law. The Merger became effective at 8:35 a.m., New York City Time, on November 7, 2016, pursuant to the Certificate of Merger filed with the Secretary of State of the State of Delaware.

As a result of the Merger, the Company has terminated all offerings of its Shares pursuant to its existing Registration Statement under the Securities Act of 1933, as amended. In accordance with an undertaking made by the Company in the Registration Statement to remove from registration, by means of a post-effective amendment, any Shares which remain unsold at the termination of the offering, the Company hereby removes from registration all Shares registered under the Registration Statement that remain unsold as of the date hereof and terminates the effectiveness of the Registration Statement.