How To Calculate Network Address From Subnet Mask?
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To calculate a network address from a subnet mask, you‘ll need to do a bitwise AND operation between the IP address and the subnet mask. This will give you the network address for the IP address and subnet mask combination.
For example, if the IP address is 192.168.1.200 and the subnet mask is 255.255.255.0 then the calculation looks like this:
192.168.1.200 & 255.255.255.0 = 192.168.1.0 (network address)