Today, some Wireless N routers can operate on both 2.4 GHz and 5 GHz bands concurrently . Routers could function just as well at 2.3 or 2.5 GHz, but they’re not allowed. It’s the rules. The 2.4 GHz band, which runs from about 2,400 to 2,483.5 Mhz, is where routers have to live.