The IP class procedure does not split the 32-bit address space into same size class and the classes do not have the same value of networks.
A prefix of n bits gives 2n unique network value, while a suffix of n bits allows 2n host numbers to be given on a given network. This is define in the table below.
CLASSFUL ADDRESSING EXAMPLE:
Here we have a private TCP/IP protocol network, which contains of four physical networks as given in the figure below.
The first step is to give IP addresses in which generally class C addresses are assigned. Network administrator systems the ultimate size of every physical network and gives a prefix.