IP Classless Addressing Block Sizes and Classful Network Equivalents
Because CIDR allows you to divide IP addresses into network IDs and host IDs along any bit boundary, it allows for the creation of dozens of different sizes of networks. As with subnetting, the size of network is a trade-off between the number of bits used for the network ID and the number used for the host ID. Unlike conventional subnetting, where a single choice is made for all subnets, CIDR allows many levels of hierarchical division of the Internet, so many sizes of networks exist simultaneously. Larger networks are created and subdivided into smaller ones.
Since many people are used to looking at IP address blocks in terms of their classful sizes, it is common to express ...
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