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Definition of CIDR | | | | | Classes Inter Domain Routing. An Internet routing paradigm that passes both the network prefix and a mask of significant bits in the prefix within the routing exchange. This supercedes the earlier paradigm of classful routing, where the mask of significant bits is inferred by the value of the prefix (where Class A network prefixes infer a mask of 8 bits, Class B network prefixes infer a mask of 16 bits, and Class C network prefixes infer a mask of 24 bits). CIDR commonly is used to denote an Internet environment in which no implicit assumption exists of the Class A, B, and C network addresses. BGP (Border Gateway Protocol) version 4 is used as the de facto method of providing CIDR support in the Internet today. | | | |
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