In this case, 16 bits are available to denote the subnets which comes to a total of 65,536 LANs.ĬIDR has many benefits compared to the classful network addressing that was in use previously. If the IPv6 range allocated to the organization is /48, the remaining bits until the 64 th bit will be used for subnetting purposes. Using 64-bit network prefixes means each IPv6 LAN has a total of 18,446,744,073,709,551,616 IPv6 addresses. Unlike the IPv4 local area networks (LAN) which uses variable length network prefixes, IPv6 local area networks uses 64-bit prefixes. The CIDR notation consists of the IP address then a forward slash followed by a decimal number denoting how many bits are in the network prefix. With the CIDR, you can have an arbitrary-length prefixes via the use of variable-length subnet masking (VLSM). ThisĬIDR was introduced to allow for more efficient allocation of IP address ranges. The previously used classful network addressing (Class A, Class B & Class C) only allows the network prefix in one or more 8-bit group which often are not fully utilized. More efficient allocation of IP addresses The network prefix denotes which network or subnet the IP address belongs to while the host identifier specifies which interface of a host on the network. IP addresses have 2 parts which are the network prefix and the host identifier. CIDR is an acronym for Classless Inter-Domain Routing and is how IP addresses are allocated.
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