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With the class addressing, it divides IP address into three classes, class A, class B
and class C. The rest of IP addresses are for multicast and broadcast. The bit
length of the network prefix is the same as that of the subnet mask and is denoted
as IP address/X, for example, 192.168.1.0/24. Each class has its address range
described below.
Class A:
Address is less than 126.255.255.255. There are a total of 126 networks can be
defined because the address 0.0.0.0 is reserved for default route and 127.0.0.0/8 is
reserved for loopback function.
0
Class B:
IP address range between 128.0.0.0 and 191.255.255.255. Each class B network
has a 16-bit network prefix followed 16-bit host address. There are 16,384 (2^14)/16
networks able to be defined with a maximum of 65534 (2^16 –2) hosts per network.
10
Class C:
IP address range between 192.0.0.0 and 223.255.255.255. Each class C network
has a 24-bit network prefix followed 8-bit host address. There are 2,097,152
(2^21)/24 networks able to be defined with a maximum of 254 (2^8 –2) hosts per
network.
110
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