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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 .
Classful network design served its purpose in the startup stage of the Internet, but it lacked scalability in the face of the rapid expansion of networking in the 1990s. The class system of the address space was replaced with Classless Inter-Domain Routing (CIDR) in 1993. CIDR is based on variable-length subnet masking (VLSM) to allow ...
1993 (): Classless Inter-Domain Routing (CIDR) 1993 (): InterNIC established; 1993 (): AOL added USENET access; 1993 (): Mosaic web browser released; 1994 (): Full text web search engines; 1994 (): North American Network Operators' Group (NANOG) established; Commercialization, privatization, broader access leads to the modern Internet:
The leading set of bits of the addresses are identical for all hosts in a given network, and are called the network's address or routing prefix. Network address ranges are written in CIDR notation. A network is denoted by the first address in the block (ending in all zeroes), a slash (/), and a decimal value equal to the size in bits of the prefix.
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 ...
This notation was introduced with Classless Inter-Domain Routing (CIDR). [2] In IPv6 this is the only standards-based form to denote network or routing prefixes. For example, the IPv4 network 192.0.2.0 with the subnet mask 255.255.255.0 is written as 192.0.2.0 / 24 , and the IPv6 notation 2001:db8:: / 32 designates the address 2001:db8:: and ...
Since the introduction of the CIDR system, IANA has typically allocated address space in the size of /8 prefix blocks for IPv4 and /23 to/12 prefix blocks from the 2000::/3 IPv6 block to requesting regional registries as needed. Since the exhaustion of the Internet Protocol Version 4 address space, no further IPv4 address space is allocated by ...
2NF—second normal form; 3GL—third-generation programming language; 3GPP—3rd Generation Partnership Project – 3G comms; 3GPP2—3rd Generation Partnership Project 2; 3NF—third normal form; 386—Intel 80386 processor; 486—Intel 80486 processor; 4B5BLF—4-bit 5-bit local fiber; 4GL—fourth-generation programming language; 4NF ...