Subnet Class

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Subnets come in three sizes Class AClass B and Class C.  Subnets are made up of 4 octets which in turn make IP addresses.  The table below Shows the Class, the number of bits for the network ID and the octet that each Class shares.

Subnet Classes
 IP AddressClass Total # Of Bits For Network ID / Host ID 1st Octet 2nd Octet 3rd Octet 4th Octet
Class A 8/24 11111111 (255) 00000000(0) 00000000(0) 00000000(0)
Class B 16/16 11111111 (255) 11111111(255) 00000000(0) 00000000(0)
Class C 24/8 11111111 (255) 11111111(255) 11111111(255) 00000000(0)

 

See also:
IP Address
Octet
CIDR

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