This scheme assumes that no classes exist and is how routers on the Internet interpret IPv4 addresses. In classless addressing, the IPv4 network mask or prefix determines the boundary between the ...

Small pool The net is built around version four of the Internet Protocol addressing scheme (IPv4) which has space for about four billion addresses. Its successor - IPv6 - has trillions available.

In May, ARIN, the organization giving out IP address in North America, told us it's time to start adopting IPv6. Five months and another 76 million IPv4 addresses later, ARIN's European ...