The FCC has adopted a Notice of Proposed Rulemaking (NPRM) proposing flexible use for 500 MHz of mid-band spectrum between 3.7 and 4.2 GHz. Seeking to allocate spectrum for new wireless uses while treating existing users fairly, the FCC asks Fixed Satellite Service (FSS) earth stations operating in the band to certify the accuracy of their existing registration and license information, part of the commission's effort to understand how the band is being used.