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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 .
Specify lists of address ranges, e.g. in CIDR format, for various address families. Experimental. SINK 40 — Defined by the Kitchen Sink Internet Draft, but never made it to RFC status GPOS 27 RFC 1712 A more limited early version of the LOC record UINFO 100 —
Last version of IANA table with historical notes via the Internet Archive Wayback Machine. Turtschi, Adrian (13 September 1999). "Complete List of Class A and Class B Networks". Adrian Turtschi; Rogers, Paul (November 1999). "IP INDEX Encyclopedia". flumps.org. Archived from the original on 14 April 2001
The following table is a list of notable well-known IPv4 addresses that are reserved for IP multicasting and that are registered with the Internet Assigned Numbers Authority (IANA). [ 5 ] IP multicast address
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Special address blocks Address block (CIDR) First address Last address Number of addresses Usage Purpose ::/128 :: :: 1 Software Unspecified address
Longest prefix match (also called Maximum prefix length match) refers to an algorithm used by routers in Internet Protocol (IP) networking to select an entry from a routing table. [1] Because each entry in a forwarding table may specify a sub-network, one destination address may match more than one forwarding table entry. The most specific of ...
CIDR was designed to permit repartitioning of any address space so that smaller or larger blocks of addresses could be allocated to users. The hierarchical structure created by CIDR is managed by the Internet Assigned Numbers Authority (IANA) and the regional Internet registries (RIRs).