NetworkInterface[] NetworkInterfaces = NetworkInterface.GetAllNetworkInterfaces();

foreach (NetworkInterface NetworkIntf in NetworkInterfaces)

{

    IPInterfaceProperties IPInterfaceProperties = NetworkIntf.GetIPProperties();

    UnicastIPAddressInformationCollection UnicastIPAddressInformationCollection = IPInterfaceProperties.UnicastAddresses;

    foreach (UnicastIPAddressInformation UnicastIPAddressInformation in UnicastIPAddressInformationCollection)

    {

        if (UnicastIPAddressInformation.Address.AddressFamily == AddressFamily.InterNetwork)

        {

            Console.WriteLine(UnicastIPAddressInformation.Address);

        }

    }

}