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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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