< 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 .
[Is this true? Relation to classes?]
(1997-03-06)