如何获取公网ip地址

Question

我这里用路由上网，本机配置的地址是192.168.1.2
我用下面的代码            System.Net.IPHostEntry ips = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName());
            foreach (System.Net.IPAddress ip in ips.AddressList)
            {
                Console.WriteLine(ip.ToString());
            }只获取192.168.1.2地址，根本获取不到公网的地址，那个前辈知道怎么获取呢？谢谢

Answer 1

用udp向远程服务发消息就能得到外网ip和端口，再发回来就行了

Answer 2

http://webservice.webxml.com.cn/WebServices/IpAddressSearchWebService.asmx
这是个免费的

Answer 3

static string GetIP()
{
Uri uri = new Uri("http://www.ciker.net/ip/index.asp");
System.Net.HttpWebRequest req = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(uri);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = 0;
req.CookieContainer = new System.Net.CookieContainer();
req.GetRequestStream().Write(new byte[0], 0, 0);
System.Net.HttpWebResponse res = (System.Net.HttpWebResponse)(req.GetResponse());
StreamReader rs = new StreamReader(res.GetResponseStream(), System.Text.Encoding.GetEncoding("GB2312"));
string s = rs.ReadToEnd();
rs.Close();
req.Abort();
res.Close();
System.Text.RegularExpressions.Match m = System.Text.RegularExpressions.Regex.Match(s, @"您的IP：(?<IP>[0-9\.]*)");
if (m.Success)
{
return m.Groups["IP"].Value;
}
else
{
return "Failed..";
}
} 

Answer 4

访问这个地址：http://www.5iportal.net/getip.aspx

Answer 5

static string GetPage(string url) 
  { 
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url); 
    try 
    { 
      using (HttpWebResponse res = (HttpWebResponse)req.GetResponse()) 
      { 
        using (StreamReader sr = new StreamReader(res.GetResponseStream())) 
        { 
          return sr.ReadToEnd(); 
        } 
      } 
    } 
    catch (System.Exception e) 
    { 
      return e.Message; 
    } 
    finally 
    { 
      req.Abort(); 
    } 
  } 
  // 通过外部网站得到本机的外部IP 
  static string GetOuterIP() 
  { 
    string patt = @"IP: \[(? <IP>[0-9\.]*)\]"; 
    string url  = ""; 
    return Regex.Match(GetPage(url), patt).Groups["IP"].Value; 
  }   static void Main() 
  { 
    foreach (IPAddress ip in Dns.GetHostEntry(Dns.GetHostName()).AddressList) 
    { 
      Console.WriteLine(ip); 
    } 
    Console.WriteLine(); 
    Console.WriteLine(GetOuterIP()); 
  }

Answer 6

string GetIp() 
    { 
        string userIP = Request.ServerVariables["HTTP_X_FORWARDED_FOR"]; 
        if (userIP == null || userIP == "") 
        { 
            userIP = Request.ServerVariables["REMOTE_ADDR"];         } 
        return userIP; 
} 

Answer 7

        /// <summary>
        /// 获得使用转发服务器下的用户真实ip
        /// </summary>
        /// <returns></returns>
        public static string GetFormIpByTransmit(HttpRequest request)
        {
            string ret = string.Empty;            ret = request.Headers["X-Client-Address"];            if (string.IsNullOrEmpty(ret))
            {
                ret = request.UserHostAddress;
            }
            else
            {
                // 如果客户端
                if (ret.IndexOf(",") >= 0)
                {
                    string[] ss = StringUtils.GetStrings(ret, ",");
                    ret = ss[ss.Length - 1];
                }
            }            return ret;
            
        }

Answer 8

或者申请个动态域名，在你的机器上装个动态域名解析的客户端，然后你去获取你申请的这个域名的地址就OK了。不过这个办法麻烦点儿。以前我用过去Ip138等网站上去截取，但是有时候网站不稳定。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;public partial class IP_ShowIP : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.Write("custom:"+Request.UserHostAddress+"<br>server:"+System.Net.Dns.GetHostAddresses("xxx.3322.org")[0].ToString());
    }
}
//228.92.40.38

Answer 9

这个方法就行
/// <summary>
        /// 获得用户IP
        /// </summary>
        public string GetUserIp()
        {
            string ip;
            string[] temp;
            bool isErr = false;
            if (HttpContext.Current.Request.ServerVariables["HTTP_X_ForWARDED_For"] == null)
                ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
            else
                ip = HttpContext.Current.Request.ServerVariables["HTTP_X_ForWARDED_For"].ToString();
            if (ip.Length > 15)
                isErr = true;
            else
            {
                temp = ip.Split('.');
                if (temp.Length == 4)
                {
                    for (int i = 0; i < temp.Length; i++)
                    {
                        if (temp[i].Length > 3) isErr = true;
                    }
                }
                else
                    isErr = true;
            }            if (isErr)
                return "1.1.1.1";
            else
                return ip;
        }放到服务器上后就是外网的了，本地调试是就是自己的局域网内的你可以试试祝你好运