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Address Classes
The structure of an IP address differs depending on the
class of the local network to which the host is
connected:
- Class A Network
- the first (or leftmost) field, or byte, of the address
specifies the network number and class, and can take values from 1
to 126.
- Class B network
- the leftmost two fields (bytes) specify the network number and
class. The first field is in the range from 128 to 191, and the
second from 1 to 254.
- Class C network
- the leftmost three fields specify network number and class. The
first field can be from 192 to 223, the second from 0 to 255, and
the third from 1 to 254.
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