Classless interdomain routing. Technique supported by BGP4 and based on route aggregation. CIDR allows routers to group routes together in order to cut down on the quantity of routing information carried by the core routers. With CIDR, several IP networks appear to networks outside the group as a single, larger entity.

CIDR: Classless Inter-Domain Routing

An abbreviation for Classless Inter-Domain Routing, CIDR is a method for defining networks with any bit-length subnet prefix length. CIDR is used in allocating Internet Protocol (IP) addresses and routing IP packets.

CIDR (Classless Inter-Domain Routing) is an IP addressing scheme that allows network administrators to subdivide a block of IP addresses to create more usable address space. CIDR IP addresses are norm [..]

Classless Inter Domain Routing is a method of categorizing IP addresses for the purpose of allocating IP addresses to users and for efficiently routing IP packets on the Internet

CIDR (Classless Inter-Domain Routing Notification) is a standard syntax for specifying IP addresses and their associated routing prefix. The routing prefix is shown as an appended slash character and [..]

(Classless Inter-Domain Routing)

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.