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I want to get client subnet mask using c#.
How can I get it?
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The network ID is found by logically ANDing the binary form of the IP address with the binary form of the subnet mask for the network. For example, if a host has an IP address of 172.16. 8.55 on a network with a subnet mask of 255.255. 0.0 (the default subnet mask), the network ID of the host is 172.16.
To calculate the IP Address Subnet you need to perform a bit-wise AND operation (1+1=1, 1+0 or 0+1 =0, 0+0=0) on the host IP address and subnet mask. The result is the subnet address in which the host is situated.
First of all, check NetworkInterface class first. There are a lot of information in it. And these articles will be helpful for you:
IP Address Calculations with C# (Subnetmasks, Networks, …)Get Subnet MaskFinding subnet mask from IP4 address using c#
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