What is a Class B subnet?

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A class B subnet uses the first and second octets of an IP address to designate the network ID, and the remaining two octets for the designation of the Host ID.

Host ID
|   |
|   |
ip address    xxx.xxx.xxx.xxx
|  /
| /
Network ID

The first two bits of the first octet are always set to one zero, 10 to indicate a Class B address. This leaves 14 bits to represent the Network ID giving a possible 16,384 network addresses.

The remaining 16 bits are available to designate the host ID, this provides for 65,534 or (216)-2 hosts per network.

Gordano software assumes that you are using a Class C subnet mask for local mail authentication. If you are using a Class B subnet, you will need to alter the local IP settings appropriately.

Keywords:IP address subnet class

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