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How many Class A, B, and C networks are there? Class A
networks use 7 bits for the network ID, so 128 Class A networks are
possible. Class B addresses use 6 bits from the first octet and all
8 bits of the second octet, so there are 16,384 networks (64 x 256),
64 from the first octet and 256 from the second octet. Class C
addresses use 5 bits from the first octet, 8 bits from the second
octet, and 8 bits from the third octet, so there are 2,097,152
possible Class C networks (32 x 256 x 256). Class D addresses are
not associated with networks but with multicast groups. |
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