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How do you calculate a subnet mask address of networking?

In: Computer Networking, Local Area Network, How-To [Edit categories]

Answer:

Calculating a subnet mask depends on whether you are using the default, classful mask or a true subnet mask to divide a network into smaller pieces.

The defaults are on octet boundaries (every 8 bits):

255.0.0.0 class A network
255.255.0.0 class B network
255.255.255.0 class C network

Any other type of subnet mask with 4 octets (iPV4) can use combinations of those with any octet value from 0 - 255. No number may be larger than 255.

Calculating other subnet masks would be based on how many subnets you want in the network. You could have values such as:

255.192.0.0
255.255.248.0.0
255.255.255.252

The first octet must at least be 255. The other octets may change, based on whether it is a classful default network or it is being subnetted.

First answer by Enigmamerlin. Last edit by Enigmamerlin. Contributor trust: 107 [recommend contributor ]. Question popularity: 2 [recommend question].

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