Classless Inter-Domain Routing

<networking> (CIDR) /sid*r/ A scheme which allocates blocks of Internet addresses in a way that allows summarisation into a smaller number of routing table entries.

A CIDR block is a block of Internet addresses assigned to an Internet Service Provider (ISP) by the Internic.

CIDR was introduced to enable the use of more sophisticated routing protocols such as OSPF.

See RFC 1467, RFC 1518, RFC 1519 and RFC 1520.

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