Class B IP Addressing

128.0.0.0/16 to 191.255.0.0/16 (16,384 Networks)


NNNNNNNN.NNNNNNNN.HHHHHHHH.HHHHHHHH
10xxxxxx.xxxxxxxx.xxxxxxxx.xxxxxxx


Having 16 bits for host addresses means that each Class B network has 65,535 mathematically possible host addresses. the first 2 bits of the first octet must be 10. Starting the bit pattern of the first octet with a 10 separates this space from the upper limits of the Class A space.

The highest value of the first octet is 10111111 or 191 (128 + 32 + 16 + 8 + 4 + 2 + 1)

The last two octets of a Class B address represent possible host addresses within each specific network number. As with the Class A address space, the entire address must be globally unique. Individual host addresses can be duplicated within each network address.

The range of possible Class B network addresses is from 128.0.0.0 to 191.255.0.0

Valid host addresses for Class B networks range from x.x.0.0 to x.x.255.255 .

Hosts 160.10.1.32 and 160.10.242.17 would be on the same network (160.10.0.0).



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