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* Greater use of [[hierarchy]] in address assignments (''prefix aggregation''), lowering the overhead of the [[Internet]]-wide [[routing]].
==Background==▼
[[IP address]]es are separated into two parts: the ''network address'' (which identifies a whole network or subnet), and the ''host address'' (which identifies a particular machine's connection or interface to that network). This division is used to control how traffic is routed in and among [[Internet Protocol|IP]] networks.▼
Historically, the IP address space was divided into three main '[[classful network|classes of network]]', where each class had a fixed network size. The class, and hence the length of the subnet mask and the number of hosts on the network, could always be determined from the most significant bits of the IP address. Without any other way of specifying the length of a subnet mask, [[routing|routing protocols]] necessarily used the class of the IP address specified in route advertisements to determine the size of the routing prefixes to be set up in the [[routing table]]s.▼
==Key Concepts==
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▲==Historical Background==
▲[[IP address]]es are separated into two parts: the ''network address'' (which identifies a whole network or subnet), and the ''host address'' (which identifies a particular machine's connection or interface to that network). This division is used to control how traffic is routed in and among [[Internet Protocol|IP]] networks.
▲Historically, the IP address space was divided into three main '[[classful network|classes of network]]', where each class had a fixed network size. The class, and hence the length of the subnet mask and the number of hosts on the network, could always be determined from the most significant bits of the IP address. Without any other way of specifying the length of a subnet mask, [[routing|routing protocols]] necessarily used the class of the IP address specified in route advertisements to determine the size of the routing prefixes to be set up in the [[routing table]]s.
==External links==
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