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Classless Inter-Domain Routing (CIDR / ˈ s aɪ d ər, ˈ s ɪ-/) is a method for allocating IP addresses for IP routing. The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous classful network addressing architecture on the Internet .
The subnet mask or CIDR notation determines how the IP address is divided into network and host parts. The term subnet mask is only used within IPv4. Both IP versions however use the CIDR concept and notation. In this, the IP address is followed by a slash and the number (in decimal) of bits used for the network part, also called the routing ...
Special address blocks Address block (CIDR) First address Last address Number of addresses Usage Purpose ::/128 :: :: 1 Software Unspecified address
CIDR: Classless Inter-Domain Routing Architecture RFC 1518 RFC 1519 CIR: Committed Information Rate (Frame Relay) Telecom RFC 1490 RFC 1973 RFC 2427 CLI: Command line interpreter Hardware Catalyst 6500 Series Command Reference, 7.6, for example CPE: Customer premises equipment Telecom Telecom Glossary: CPU: Central processing Unit ...
A wildcard mask is a mask of bits that indicates which parts of an IP address are available for examination. In the Cisco IOS, [1] they are used in several places, for example:
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The CIDR notation for this group is 224.0.0.0 / 4. [1] The group includes the addresses from 224.0.0.0 to 239.255.255.255 . The address range is divided into blocks each assigned a specific purpose or behavior.
A gateway is a network node that serves as an access point to another network, often involving not only a change of addressing, but also a different networking technology.