How To Calculate The Subnet Mask?
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To calculate the Subnet Mask, you will need to determine the number of subnets needed and the number of hosts per subnet. Then, you can use the Subnetting Cheat Sheet to determine the subnet mask and other details. The Subnetting Cheat Sheet is available online and provides the binary subnet mask for a given network size. You can also use an online Subnet Calculator to easily calculate the subnet mask.
To calculate a subnet mask, you need to determine the number of hosts you need in each subnet and then convert that value to binary. Then, count the number of 1’s in the binary value, and add it to the default subnet mask (255.255.255.0). For example, if you need 8 hosts in each subnet, the binary value would be 00001000, which has 1 1. Add that to the default subnet mask and you would get a subnet mask of 255.255.255.128.