using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.NetworkInformation;
using System.Text;

namespace IpDiscover
{
    class Program
    {
        static IPAddress[] GetIps1()
        {
            return Dns.GetHostAddresses(Dns.GetHostName());
        }

        static IPAddress[] GetIps2()
        {
            List<IPAddress> list = new List<IPAddress>();

            NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
            foreach (NetworkInterface adapter in interfaces)
            {
                if (adapter.OperationalStatus == OperationalStatus.Up)
                {
                    foreach (UnicastIPAddressInformation ipu in adapter.GetIPProperties().UnicastAddresses)
                    {
                        IPAddress ip = ipu.Address;
                        list.Add(ip);
                    }
                }
            }

            return list.ToArray();
        }

        static void Main(string[] args)
        {
            string out1 = "";
            string out2 = "";

            Console.WriteLine("Please wait...");

            IPAddress[] ips = GetIps2();
            foreach (IPAddress ip in ips)
            {
                try
                {
                    if (ip.AddressFamily != System.Net.Sockets.AddressFamily.InterNetwork)
                        throw new Exception("Not an ipv4");

                    var request = (HttpWebRequest)HttpWebRequest.Create("http://www.clodo.it/projects/whatismyip/");
                    request.KeepAlive = false;
                    request.Timeout = 5000;
                    request.ReadWriteTimeout = 5000;
                    request.ServicePoint.BindIPEndPointDelegate = delegate
                    {
                        return new IPEndPoint(ip, 0);
                    };
                    var response = (HttpWebResponse)request.GetResponse();
                    Stream receiveStream = response.GetResponseStream();
                    StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);

                    string result = readStream.ReadToEnd().Trim();
                    out1 += result + "\r\n";
                    out2 += ip.ToString() + ", " + result + "\r\n";
                    response.Close();
                }
                catch (Exception e)
                {
                    out2 += ip.ToString() + ", " + e.Message + "\r\n";
                }
            }

            Console.WriteLine("");
            //Console.WriteLine("Result:");
            Console.WriteLine(out1);
            //Console.WriteLine("Debug:");
            //Console.WriteLine(out2);

            Console.WriteLine("Press any key to close.");
            Console.ReadKey();
        }
    }
}