class Program  
{  
    static void Main(string[] args)  
    {  
        Console.WriteLine(GetExportIP());  
  
        Console.ReadKey();  
    }  
  
    public static string GetExportIP()   
    {  
        //获取外部IP  
        string strUrl = "http://www.ip.cn/getip.php?action=getip&ip_url=&from=web";  
        //string strUrl = "http://216.157.85.151/getip.php?action=getip&ip_url=&from=web";  
        Uri uri = new Uri(strUrl);  
        WebRequest webreq = WebRequest.Create(uri);  
        Stream s = webreq.GetResponse().GetResponseStream();  
        StreamReader sr = new StreamReader(s, Encoding.Default);  
        string all = sr.ReadToEnd();  
        all = Regex.Replace(all,@"(\d+)","000$1");  
        all = Regex.Replace(all, @"0+(\d{3})", "$1");  
        string reg = @"(\d{3}\.\d{3}\.\d{3}\.\d{3})";  
        Regex regex = new Regex(reg);  
        Match match = regex.Match(all);  
        string ip = match.Groups[1].Value;  
        return Regex.Replace(ip,@"0*(\d+)","$1");  
    }  
}  

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
using System.Management;  
  
namespace _17获取MAC地址  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            ManagementObjectSearcher nisc = new ManagementObjectSearcher("select * from Win32_NetworkAdapterConfiguration");  
            foreach (ManagementObject nic in nisc.Get())   
            {  
                if (Convert.ToBoolean(nic["ipEnabled"]) == true)   
                {  
                    Console.WriteLine("{0} - {1}", nic["ServiceName"], nic["MACAddress"]);  
                }  
            }  
  
            Console.ReadKey();  
        }  
    }  
}