兰亭序

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net;
using System.Net.Sockets;

public partial class test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string strDomain = www.baidu.com;
        IPHostEntry hostEntry = Dns.Resolve(strDomain);
        IPEndPoint ipEndPoint = new IPEndPoint(hostEntry.AddressList[0], 0);
        //这就是你想要的
        string ipAddress = ipEndPoint.Address.ToString();

        Response.Write(ipAddress);

    }
}