Communication on and between networks today relies on a systematic scheme built upon Internet Protocol (IP) Addressing. An IP address consists of a network ID and host ID and is broken down into five classes of addressing. These classes are best assigned and used according to the estimated number of hosts you anticipate having on your network.
Class A
A Class A network covers the IP address range of 1.0.0.0 – 126.255.255.255, with a subnet mask of 255.0.0.0 or /8 (pronounced “Slash 8”). A Class A network can have a maximum of 126 networks and 16,777,214 hosts.
Class B
A Class B network covers the IP address range of 128.0.0.0 – 191.255.255.255, with a subnet mask of 255.255.0.0 or /16. A Class B network can have a maximum 16,384 networks and 65,534 hosts.
Class C
A Class C network covers the IP address range of 192.0.0.0 – 223.255.255.255, with a subnet mask of 255.255.255.0 or /24. A Class C network can have a maximum of 2,097,152 networks and 254 hosts.
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