See below for a short function that validates a given IP address:
public static Boolean ValidateIP(string inputIP)
{
var ipParts = inputIP.Split('.');
return Int32.Parse(ipParts [0]) < 256 &&
Int32.Parse(ipParts [1]) < 256&
Int32.Parse(ipParts [2]) < 256 &
Int32.Parse(ipParts [3]) < 256;
}
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