Andrew von Nagy of Revolution Wi-Fi comments:

Given the recent FCC Report & Order on U-NII (Unlicensed National Information Infrastructure) rule changes in March/April of 2014, I thought it would be helpful to recap the new regulations in the United States regarding the 5 GHz unlicensed spectrum bands. I’ve put together the following table for quick reference:

Andrew has some great info here for the 5 GHz band here. Be sure to read up now that more and more devices are using 5 GHz.

Read more at: U-NII Unlicensed Spectrum Inventory in 5 GHz Bands