For example, if you have eight networks and each requires 10 hosts, you would use the Class C mask of 255.255.255.240. Why? Because 240 in binary is 11110000, which means you have four subnet bits ...

The host bits are further divided between subnets and hosts. See subnet mask and subnet. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.

The subnet ID number is shared with the host ID. See subnet mask and subnet mask tables. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction requires permission.