Classless Inter-Domain Routing

Classless Inter-Domain Routing (CIDR) is a technique that summarizes a block of Internet addresses in a as an IP address in dotted decimal notation followed by a forward slash and a two-digit decimal number giving the number of leading one bits in the . For example, 123.123.123.0/24 specifies a subnet mask of 11111111.11111111.11111111.00000000 (binary), implying the block of addresses 123.123.123.0 through 123.123.123.255.
==Description==
According to RFC 1519, CIDR was implemented to distribute Internet address space more efficiently and to provide a mechanism for IP . This in turn reduces the number of entries in IP routing tables, enabling faster, more efficient routing, e.g. using s such as . CIDR is supported by 4.. 2006-01-26.
CIDR is "classless" because it is not limited to the subnet masks specified by IP address classes A, B and C.
==References==
==External links==
* and at Wikipedia
Category:Internet
Category:Terms