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Classless Inter-Domain Routing

   Also found in: Acronyms, Wikipedia 0.02 sec.
(networking)Classless Inter-Domain Routing - (CIDR) /sid*r/ A technique that summarises a block of Internet addresses in a routing table as an 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 subnet mask. 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.

CIDR is "classless" because it is not limited to the subnet masks specified by Internet address classes A, B and C.

According to RFC 1519, CIDR was implemented to distribute Internet address space more efficiently and to provide a mechanism for IP route aggregation. This in turn reduces the number of entries in IP routing tables, enabling faster, more efficient routing, e.g. using routing protocols such as OSPF. CIDR is supported by BGP4.

See also RFC 1467, RFC 1518, RFC 1520.


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Forget the much-ballyhooed Ipv4 address-exhaustion problem of a few years back; Classless Inter-Domain Routing (CIDR) and Network Address Translation (NAT) took care of that.
Let BGP Convoy Your Data Home by Trowbridge, Dave / Computer Technology Review
The IS-IS Routing Emulation Option provides convenient network set-up via its graphical user interface with network addresses specified in Classless Inter-Domain Routing format.
Spirent Communications Announces IS-IS Routing Emulation and Traffic ... by Business Wire
These solutions offer a modular architecture to increase design flexibility for the highest performance for specific networking applications, such as Classless Inter-domain Routing (CIDR), Virtual Private Networking (VPN), and Internet security.
NetLogic Microsystems Collaborates With Xilinx to Offer Reference ... by Business Wire
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