Subject: CIDR -- Classless Inter-Domain Routing
Author: IpGuru
Posted on: 12/17/2010 03:17:57 PM
CIDR stands for Classless Inter-Domain Routing which is a methodology of allocating IP addresses and routing Internet Protocol packets.
An IP address is interpreted as composed of two parts: a network-identifying prefix followed by a host identifier within that network.
CIDR blocks are identified using a syntax similar to that of IPv4 addresses: a four-part dotted-decimal address, followed by a slash, then a number from 0 to 32: A.B.C.D/N.
The number following the slash is the prefix length, the number of shared initial bits, counting from the most significant bit of the address.
An IP address is part of a CIDR block, and is said to match the CIDR prefix, if the initial N bits of the address and the CIDR prefix are the same.
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