BF2Statistics.Net.Networking.IsLanIP C# (CSharp) Method

        public static bool IsLanIP(IPAddress address)
        {
            var interfaces = NetworkInterface.GetAllNetworkInterfaces();
            foreach (var iface in interfaces)
            {
                var properties = iface.GetIPProperties();
                foreach (var ifAddr in properties.UnicastAddresses)
                {
                    if (ifAddr.IPv4Mask != null &&
                        ifAddr.Address.AddressFamily == AddressFamily.InterNetwork &&
                        CheckMask(ifAddr.Address, ifAddr.IPv4Mask, address))
                        return true;
                }
            }
            return false;
        }