Class A uses the first octet for the network address, and the rest for host addresses within this network. For example, a site whose network address is 129.0.0.0 would own the 224 addresses between 129.0.0.0 and 129.255.255.255.
Network |
Host |
|
|
---|---|---|---|
0xxxxxxx |
xxxxxxxx |
xxxxxxxx |
xxxxxxxx |
Class B uses two octets for the network address, and two for the host address. For example, a site whose network address is 129.123.0.0 would own the 216 addresses between 129.123.0.0 and 129.123.255.255.
Network |
Host |
|
|
---|---|---|---|
10xxxxxx |
xxxxxxxx |
xxxxxxxx |
xxxxxxxx |
Class C uses three octets for the network address, and one octet for the host address. For example, a site whose network address is 129.123.56.0 would own the 28 addresses between 129.123.56.0 and 129.123.56.255.
Network |
Host |
|
|
---|---|---|---|
110xxxxx |
xxxxxxxx |
xxxxxxxx |
xxxxxxxx |