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Use a CIDR calculator such as, cidr / vlsm supernet calculator.
192.168.0.0/24 gives 256 addresses, address range of 192.168.0.0 - 192.168.0.255
If we want to split that into 4 subnets:
192.168.0.0/26 gives 64 addresses, address range of 192.168.0.0 - 192.168.0.63
192.168.0.64/26 gives 64 addresses, address range of 192.168.0.64 - 192.168.0.127
192.168.0.128/26 gives 64 addresses, address range of 192.168.0.128 - 192.168.0.191
192.168.0.192/26 gives 64 addresses, address range of 192.168.0.192 - 192.168.0.255
The size of a CIDR is 2**(32-width of prefix). For instance 192.168.0.0/24 is 2**(32-24) = 2**8 = 256.
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