Network classes are all about the subnet mask. Class A networks have a subnet mask of 255.0.0.0, Class B 255.255.0.0, Class C 255.255.255.0. The subnet mask determines the portion of the ip address...
A class C network has a subnet mask of 255.255.255.0 and can have 254 IP addresses, for example from 192.168.0.1-192.168.0.255
A class B network has a subnet mask of 255.255.0.0 and can have 255 X...