IP version 4 (IPv4) is composed of five address classes, of which the first three classes (A, B, and C) are of great interest. Class D is used in multicast technologies and class E is reserved for experimental use. The most important features of each class are detailed below:
Class
Leading Bits
Size of Network Portion
Size of Host Portion
Number of Networks
Addresses per Network
Start Address
End . . .
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