What is a Class C subnet?

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A class C subnet uses the first three octets of an IP address to designate the network ID, and the remaining octet for the designation of the Host ID.

Host ID
ip address     xxx.xxx.xxx.xxx
|   |   |
|   |   |
Network ID

The first three bits of the first octet are always set to one one zero, 110 to indicate a Class C address therefore this leaves 21 bits to represent the Network ID. These 21 bits provide 2, 097,152 network addresses. The remaining 8 bits are used for the host ID and this provides 254 or (28)-2 hosts per network

Keywords:IP Address subnet class

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