ManagementClass mc;
            mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc = mc.GetInstances();
            foreach (ManagementObject mo in moc)
            {
                //if (mo["IPEnabled"].ToString() == "True")
                //    Console.WriteLine( mo["MacAddress"].ToString());

                  if (mo["IPEnabled"].ToString() == "True")
                    Console.WriteLine(mo["MacAddress"].ToString());
            }

            Console.Read();

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