Subnet Addressing

• The network identifier and the host identifier are not always split on the boundaries defined by the corresponding class of network.

• The subnet mask, which is a required component for all IP hosts, identifies how much of the IP address indicates the network or subnetwork.

• Standard default subnet masks are as follows:

  • Class A subnet mask is 255.0.0.0 or 11111111.00000000.00000000.00000000
  • Class B subnet mask is 255.255.0.0 or 11111111.11111111.00000000.00000000
  • Class C subnet mask is 255.255.255.0 or 11111111.11111111.11111111.00000000

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