Validate alive IP address in C# (IP health test)

ipHealthTest.cs

using System;
using System.Net;
using System.Threading;
using System.Net.Sockets;

class test2 {

        private static readonly string[] listA = new string[] {"173.194.00.001", "72.233.127.00", "2607:f8b0:4003:c00::6a", "foo"};
        private static bool IsIP4;
        private static bool isUp;

        public static void Main()
        {
                foreach(string value in listA)
                {
                         System.Console.WriteLine(value);
                }

                foreach(string value in listA)
                {

                        IfTest(value);
                        System.Console.WriteLine(IsIP4.ToString());
                }

                /**
                foreach(string value in listA)
                {
                        IsServerUp(value,80,1);
                        System.Console.WriteLine(isUp);

                        if (isUp) {
                                // set h
                                break;
                                }
                }
                */
              IsServerUp("127.0.0.1",80, 10);
              System.Console.WriteLine(isUp);

        }

public static bool IsServerUp(string server, int port, int timeout)
    {
   //     bool isUp;

        try
        {
            using (TcpClient tcp = new TcpClient())
            {
                IPAddress address;
                if (IPAddress.TryParse(server, out address))
                {
                IAsyncResult ar = tcp.BeginConnect(address, port, null, null);
                WaitHandle wh = ar.AsyncWaitHandle;

                try
                {
                    if (!wh.WaitOne(TimeSpan.FromMilliseconds(timeout), false))
                    {
                        tcp.EndConnect(ar);
                        tcp.Close();
                        throw new SocketException();
                    }

                    isUp = true;
                    tcp.EndConnect(ar);
                }
                finally
                {
                    wh.Close();
                }
            }
        }
        }
        catch (SocketException)
        {
            isUp = false;
        }

        return isUp;
}

     private static bool IfTest(string input)
        {

    IPAddress address;
    if (IPAddress.TryParse(input, out address))
    {
        switch (address.AddressFamily)
        {
            case System.Net.Sockets.AddressFamily.InterNetwork:
                // we have IPv4i
                System.Console.WriteLine("4");
                IsIP4 = true;
                break;
            case System.Net.Sockets.AddressFamily.InterNetworkV6:
                // we have IPv6
                System.Console.WriteLine("6");
                IsIP4 = false;
                break;
            default:
                IsIP4 = false;
                break;
        }
    }
        return IsIP4;
        }


}