This calculator will calculate the subnet mask to use, given a TCP/IP network address and the number of subnets or nodes per subnet required.
To create the subnet mask, first remember that the purpose of the subnet mask is to separate the (32 bit) ip address into the network prefix and the host number.
If a bit in the subnet mask is 1, the corresponding bit in the IP address is part of the network address; if the bit
in the subnet mask is 0, the corresponding bit in the IP address is part of the host address.
First depict the ip address in binary.
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