C# ile sistem kodlarına erişme

public static IPAddress GetIPAddress(string hostName)
{
    Ping ping = new Ping();
    var replay = ping.Send(hostName);
    if (replay.Status == IPStatus.Success)
    {
        return replay.Address;
    }
    return null;
}
public static void Main()
{
    Console.WriteLine("Local IP Address: " + GetIPAddress(Dns.GetHostName()));
    Console.WriteLine("Google IP:" + GetIPAddress("google.com");
    Console.ReadLine();
}

using System;
using System.Net;
public class IPNetworking
{
  public static string GetIP4Address()
  {
    string IP4Address = String.Empty;
    foreach (IPAddress IPA in Dns.GetHostAddresses(Request.ServerVariables["REMOTE_ADDR"].ToString())))
    {
      if (IPA.AddressFamily.ToString() == "InterNetwork")
      {
        IP4Address = IPA.ToString();
        break;
      }
    }
    if (IP4Address != String.Empty)
    {
      return IP4Address;
    }
    foreach (IPAddress IPA in Dns.GetHostAddresses(Dns.GetHostName()))
    {
      if (IPA.AddressFamily.ToString() == "InterNetwork")
      {
        IP4Address = IPA.ToString();
        break;
      }
    }
    return IP4Address;
  }
}