c#, aspx, .net

I have below codes to get IP. In my office, it return lan IP. how can i get the public router IP?

  public string GetIP()
            string strHostName = "";
            strHostName = System.Net.Dns.GetHostName();
            IPHostEntry ipEntry = System.Net.Dns.GetHostEntry(strHostName);
            IPAddress[] addr = ipEntry.AddressList;
            return addr[addr.Length - 1].ToString();

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Quick and dirty method; bounce a request off of an external service; e.g. -
string pubIp =  new System.Net.WebClient().DownloadString("https://api.ipify.org");

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Slightly more involved method, stand-up your own HttpServer; e.g. -
HttpListener listener = new HttpListener();
while (true)
    HttpListenerContext context = listener.GetContext();
    string clientIP = context.Request.RemoteEndPoint.Address.ToString();
    using (Stream response = context.Response.OutputStream)
    using (StreamWriter writer = new StreamWriter(response))


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Point an external Dns Record at an instance of the above server and call the server instance; e.g. -
WebClient client = new WebClient();
string ip = client.DownloadString("http://HttpServerDnsAddress/PublicIP");

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Slightly more involved method will not work if you are making a loopback request.


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ITsolutionWizardAuthor Commented:
So which one should be used?
I would start with the first method to get things running.  At some point it would be beneficial to see about doing the second method so that you are not depended on a 3rd party.

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-- it_saige (https:#a42080100)
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