Is there an application I can show a client the speed of their site via differring internet connections?

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

public static class ConsoleApp
{
    public static void Main()
    {
        {
            // 192.168.20.54 is my local network with internet accessibility
            var localEndPoint = new IPEndPoint(IPAddress.Parse("192.168.20.54"), port: 0);
            var tcpClient = new TcpClient(localEndPoint);

            // No exception thrown.
            tcpClient.Connect("stackoverflow.com", 80);
        }
        {
            // 192.168.2.49 is my vpn, having no default gateway and unable to forward
            // packages to anything that is outside of 192.168.2.x
            var localEndPoint = new IPEndPoint(IPAddress.Parse("192.168.2.49"), port: 0);
            var tcpClient = new TcpClient(localEndPoint);

            // SocketException: A socket operation was attempted to an unreachable network 64.34.119.12:80
            tcpClient.Connect("stackoverflow.com", 80);
        }
    }
}

async private void btnLike_Click(object sender, EventArgs e)
{
      changeLike();
      await LikeContent();
}

async Task<int> LikeContent()
{
      await Global.getServiceClient().addContentLikeAsync(cid, uid);

      // Ensures this occurs on the UI thread - WinForms
      Invoke((Action)reloadLikes);

      return 0;
}