CIDR - определение. Что такое CIDR
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Что (кто) такое CIDR - определение

METHOD FOR IP ADDRESS ALLOCATION AND ROUTING
VLSM; Variable length subnet mask; Classless routing; Classless interdomain routing; IPv4 subnetting reference; Ipv4 subnetting reference; Classless address; Provider-based addressing; VLSM and why is it used?; CIDR address; Classless addressing; Address prefix; Address prefixes; Address Prefixes; Address Prefix; IP prefix; IP prefixes; IP Prefixes; IP Prefix; Ip prefix; Ip prefixes; IP address prefix; Classless network; /8; /16; /32; /24; /48; Variable-length subnet masking; Variable Length Subnet Mask; CIDR notation; Classless inter-domain routing; CIDR range; Variable-Length Subnet Masking; CIDR (Internet); Classless Inter Domain Routing; IPv6 subnetting reference; Classless Inter-Domain Routing notation; Cidr; CIDR Block; CIDR block; CIDR blocks; IPv6 CIDR block; IPv4 CIDR block; CIDR; /64
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  • A Table of CIDR prefixes for IPv6, it shows the number of corresponding equivalent subnets for each prefix, as well as the number of the host identifier bits.

CIDR         
Classless Internet DOMAIN Routing [Additional explanations: protocol] (Reference: RFC 1519)
CIDR         
VLSM         

Википедия

Classless Inter-Domain Routing

Classless Inter-Domain Routing (CIDR ) is a method for allocating IP addresses and for IP routing. The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous classful network addressing architecture on the Internet. 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.

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. This division is used as the basis of traffic routing between IP networks and for address allocation policies.

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. In IPv6, however, the interface identifier has a fixed size of 64 bits by convention, and smaller subnets are never allocated to end users.

CIDR is based on variable-length subnet masking (VLSM), in which network prefixes have variable length (as opposed to the fixed-length prefixing of the previous classful network design). The main benefit of this is that it grants finer control of the sizes of subnets allocated to organizations, hence slowing the exhaustion of IPv4 addresses from allocating larger subnets than needed. CIDR gave rise to a new way of writing IP addresses known as CIDR notation, in which an IP address is followed by a suffix indicating the number of bits of the prefix. Some examples of CIDR notation are the addresses 192.0.2.0/24 for IPv4 and 2001:db8::/32 for IPv6. Blocks of addresses having contiguous prefixes may be aggregated as supernets, reducing the number of entries in the global routing table.