Spectrum Inventory and Auction Act of 2011

[AI summary unavailable — showing source text] Spectrum Inventory and Auction Act of 2011 - Amends the National Telecommunications and Information Administration Organization Act to require the Assistant Secretary for Communications and Information at the Department of Commerce and the Federal Communications Commission (FCC) to: (1) inventory, at least semiannually, each broadband radio spectrum band of frequencies listed in the U.S. Table of Frequency Allocations, including the identity of each federal or non-federal user within each radio service authorized to operate in each band of frequencies, the activities and capabilities (whether space-, air-, or ground-based) supported by transmitters and other radio frequency devices, the total amount of spectrum and geographic coverage areas assigned or licensed to each user, and other specified information; and (2) make the inventory available to the public on an Internet website. Directs the Assistant Secretary and the FCC to submit to Congress a biennial report containing a recommendation of which bands of inventoried frequencies, if any, should be reallocated or made available for shared access. Sets forth exceptions for federal agencies to withhold certain national security inf…