Google Fiber is gearing up to provide access for many more users.
Before October 6th, 2015 Google Fiber owned eight IPv4 address blocks totaling around ~147 thousand IPv4 addresses. On October 6th, 2015 Google Fiber acquired the /11 IPv4 address block 188.8.131.52/11. Google Fiber first began announcing this new address block to the global BGP table on November 24th, 2015.
This /11 address block adds an additional ~2.1 million IPv4 addresses.