Get public/external IP address?

Question

I cant seem to get or find information on finding my routers public IP? Is this because it cant be done this way and would have to get it from a website?

Answer 1

With a few lines of code you can write your own Http Server for this.

HttpListener listener = new HttpListener();
listener.Prefixes.Add("http://+/PublicIP/");
listener.Start();
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))
        writer.Write(clientIP);

    context.Response.Close();
}

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Then anytime you need to know your public ip, you can do this.

WebClient client = new WebClient();
string ip = client.DownloadString("http://serverIp/PublicIP");