Class C

With Class C, the first 24 bits of the address represents a network number, the rest of the address is used to number nodes.

Class C networks were assigned a quarter of the available address space. If you see an address in the range 192.0.0.0 – 223.255.255.255 then this is a class C. There are 28 or 256 possible nodes. This is a perfect size for a small company or a school.

256 special class C addresses are reserved for internal use only and do not route on the internet, from 192.168.0.0 to 192.168.255.0 as established by RFC1918.

In this case our subnet mask would be;

Class C addresses are identified by the subnet mask 255.255.255.0 or another way we can describe this is to call is a /24, meaning that 24 bits are used for the network number.