Connecting 255 computers to a single WiFi access point, while
theoretically possible, is not recommended. Performance of such
a network will be very poor. Install multiple access points
instead to distribute the network load. By adding more access
points to the network, effectively any number of computers can
be supported (though the network becomes progressively more
difficult to manage). On a home network, while dozens of
computers and other devices may connect to the router, the
performance of a shared Internet connection will quickly degrade
as more computers access the Web simultaneously.