CIDR
Classless Inter-Domain Routing (CIDR)
CIDR is a global address assignment convention that defines how the Internet Assigned Numbers Authority (IANA), its member agencies, and ISPs should assign the globally unique IPv4 address space to individual organizations.
CIDR, defined in RFC 4632, has two main goals. First, CIDR defines a way to assign public IP addresses, worldwide, to allow route aggregation or route summarization. These route summaries greatly reduce the size of routing tables in Internet routers. Second, CIDR defines rules that allow an ISP to assign public IP addresses in blocks other than an entire Class A, B, or C network. CIDR ...
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