![]() It is based on variable-length subnet masking ( VLSM) which allows the specification of arbitrary-length prefixes. In IPv6, however, the interface identifier has a fixed size of 64 bits by convention, and smaller subnets are never allocated to end users.ĬIDR encompasses several concepts. ![]() ![]() Whereas classful network design for IPv4 sized the network prefix as one or more 8-bit groups, resulting in the blocks of Class A, B, or C addresses, under CIDR address space is allocated to Internet service providers and end users on any address-bit boundary. This division is used as the basis of traffic routing between IP networks and for address allocation policies. IP addresses are described as consisting of two groups of bits in the address: the most significant bits are the network prefix, which identifies a whole network or subnet, and the least significant set forms the host identifier, which specifies a particular interface of a host on that network. Its goal was to slow the growth of routing tables on routers across the Internet, and to help slow the rapid exhaustion of IPv4 addresses. The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous classful network addressing architecture on the Internet. Method for IP address allocation and routingĬlassless Inter-Domain Routing ( CIDR / ˈ s aɪ d ər, ˈ s ɪ-/) is a method for allocating IP addresses and for IP routing.
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