Classless interdomain routing (CIDR) allows for the aggregation of different classes of IPv4 addresses. In the original IPv4 scheme, IP addresses were designated according to class, and this designati [..]

Also known as supernetting, CIDR is a technique used to reduce the number of routing table entries a router must maintain and advertise for internal IP networks. CIDR aggregates multiple internal Class C networks into a single routing table entry; this single entry represents these multiple networks as a single entry.