supernetting

Aggregating IP network addresses advertised as a single classless network address. For example, given four Class C IP networks – 192.0.8.0, 192.0.9.0, 192.0.10.0 and 192.0.11.0 – each having the intrinsic network mask of 255.255.255.0, one can advertise the address 192.0.8.0 with a subnet mask of 255.255.252.0.