我们有请求。UserHostAddress在ASP. ASP. ASP中获取IP地址。NET,但这通常是用户的ISP的IP地址,而不是用户点击链接的机器IP地址。如何获取真实IP地址?

例如,在Stack Overflow用户配置文件中,它是:“上次帐户活动:4小时前从86.123.127.8开始”,但我的机器IP地址有点不同。Stack Overflow如何获得这个地址?

在一些web系统中,出于某些目的有一个IP地址检查。例如,对于某个IP地址,每24小时用户只能点击5次下载链接吗?这个IP地址应该是唯一的,而不是针对一个拥有大量客户端或互联网用户的ISP。

我听懂了吗?


当前回答

使用这个

Dns.GetHostEntry(Dns.GetHostName())

其他回答

您还认为用户IP地址是什么?如果你想要网络适配器的IP地址,恐怕在Web应用程序中没有办法做到这一点。如果你的用户在NAT或其他东西后面,你也无法获得IP。

更新:虽然有些网站使用IP来限制用户(如rapidshare),但它们在NAT环境中不能正常工作。

大家好,你会发现大多数代码将返回你的服务器ip地址而不是客户端ip地址。然而,这段代码返回正确的客户端ip地址。试一试。 更多信息,请检查这个

https://www.youtube.com/watch?v=Nkf37DsxYjI

对于使用javascript获取本地IP地址,您可以使用 将这段代码放在脚本标记中

<script>
    var RTCPeerConnection = /*window.RTCPeerConnection ||*/
     window.webkitRTCPeerConnection || window.mozRTCPeerConnection;

         if (RTCPeerConnection) (function () {
             var rtc = new RTCPeerConnection({ iceServers: [] });
             if (1 || window.mozRTCPeerConnection) {      
                 rtc.createDataChannel('', { reliable: false });
             };

             rtc.onicecandidate = function (evt) {

                 if (evt.candidate)
                     grepSDP("a=" + evt.candidate.candidate);
             };
             rtc.createOffer(function (offerDesc) {
                 grepSDP(offerDesc.sdp);
                 rtc.setLocalDescription(offerDesc);
             }, function (e) { console.warn("offer failed", e); });


             var addrs = Object.create(null);
             addrs["0.0.0.0"] = false;
             function updateDisplay(newAddr) {
                 if (newAddr in addrs) return;
                 else addrs[newAddr] = true;
                 var displayAddrs = Object.keys(addrs).filter(function
(k) { return addrs[k]; });
                 document.getElementById('list').textContent =
displayAddrs.join(" or perhaps ") || "n/a";
             }

             function grepSDP(sdp) {
                 var hosts = [];
                 sdp.split('\r\n').forEach(function (line) { 
                     if (~line.indexOf("a=candidate")) {   
                         var parts = line.split(' '),   
                             addr = parts[4],
                             type = parts[7];
                         if (type === 'host') updateDisplay(addr);
                     } else if (~line.indexOf("c=")) {      
                         var parts = line.split(' '),
                             addr = parts[2];
                         updateDisplay(addr);
                     }
                 });
             }
         })(); else
         {
             document.getElementById('list').innerHTML = "<code>ifconfig| grep inet | grep -v inet6 | cut -d\" \" -f2 | tail -n1</code>";
             document.getElementById('list').nextSibling.textContent = "In Chrome and Firefox your IP should display automatically, by the power of WebRTCskull.";

         }




</script>
<body>
<div id="list"></div>
</body>

和获取您的公共ip地址,您可以使用 将这段代码放在脚本标记中

  function getIP(json) {
    document.write("My public IP address is: ", json.ip);
  }


<script type="application/javascript" src="https://api.ipify.org?format=jsonp&callback=getIP"></script>

它的简单。试一试:

var remoteIpAddress = Request.HttpContext.Connection.RemoteIpAddress;

就这样吧!)

到目前为止,所有的响应都考虑了非标准化但非常常见的X-Forwarded-For报头。有一个标准化的转发头,它有点难以解析。一些例子如下:

Forwarded: for="_gazonk"
Forwarded: For="[2001:db8:cafe::17]:4711"
Forwarded: for=192.0.2.60;proto=http;by=203.0.113.43
Forwarded: for=192.0.2.43, for=198.51.100.17

我已经编写了一个类,在确定客户端的IP地址时考虑这两个头。

using System;
using System.Web;

namespace Util
{
    public static class IP
    {
        public static string GetIPAddress()
        {
            return GetIPAddress(new HttpRequestWrapper(HttpContext.Current.Request));
        }

        internal static string GetIPAddress(HttpRequestBase request)
        {
            // handle standardized 'Forwarded' header
            string forwarded = request.Headers["Forwarded"];
            if (!String.IsNullOrEmpty(forwarded))
            {
                foreach (string segment in forwarded.Split(',')[0].Split(';'))
                {
                    string[] pair = segment.Trim().Split('=');
                    if (pair.Length == 2 && pair[0].Equals("for", StringComparison.OrdinalIgnoreCase))
                    {
                        string ip = pair[1].Trim('"');

                        // IPv6 addresses are always enclosed in square brackets
                        int left = ip.IndexOf('['), right = ip.IndexOf(']');
                        if (left == 0 && right > 0)
                        {
                            return ip.Substring(1, right - 1);
                        }

                        // strip port of IPv4 addresses
                        int colon = ip.IndexOf(':');
                        if (colon != -1)
                        {
                            return ip.Substring(0, colon);
                        }

                        // this will return IPv4, "unknown", and obfuscated addresses
                        return ip;
                    }
                }
            }

            // handle non-standardized 'X-Forwarded-For' header
            string xForwardedFor = request.Headers["X-Forwarded-For"];
            if (!String.IsNullOrEmpty(xForwardedFor))
            {
                return xForwardedFor.Split(',')[0];
            }

            return request.UserHostAddress;
        }
    }
}

下面是我用来验证我的解决方案的一些单元测试:

using System.Collections.Specialized;
using System.Web;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace UtilTests
{
    [TestClass]
    public class IPTests
    {
        [TestMethod]
        public void TestForwardedObfuscated()
        {
            var request = new HttpRequestMock("for=\"_gazonk\"");
            Assert.AreEqual("_gazonk", Util.IP.GetIPAddress(request));
        }

        [TestMethod]
        public void TestForwardedIPv6()
        {
            var request = new HttpRequestMock("For=\"[2001:db8:cafe::17]:4711\"");
            Assert.AreEqual("2001:db8:cafe::17", Util.IP.GetIPAddress(request));
        }

        [TestMethod]
        public void TestForwardedIPv4()
        {
            var request = new HttpRequestMock("for=192.0.2.60;proto=http;by=203.0.113.43");
            Assert.AreEqual("192.0.2.60", Util.IP.GetIPAddress(request));
        }

        [TestMethod]
        public void TestForwardedIPv4WithPort()
        {
            var request = new HttpRequestMock("for=192.0.2.60:443;proto=http;by=203.0.113.43");
            Assert.AreEqual("192.0.2.60", Util.IP.GetIPAddress(request));
        }

        [TestMethod]
        public void TestForwardedMultiple()
        {
            var request = new HttpRequestMock("for=192.0.2.43, for=198.51.100.17");
            Assert.AreEqual("192.0.2.43", Util.IP.GetIPAddress(request));
        }
    }

    public class HttpRequestMock : HttpRequestBase
    {
        private NameValueCollection headers = new NameValueCollection();

        public HttpRequestMock(string forwarded)
        {
            headers["Forwarded"] = forwarded;
        }

        public override NameValueCollection Headers
        {
            get { return this.headers; }
        }
    }
}

IP地址是“七层堆栈”中的网络层的一部分。网络层可以对IP地址做任何它想做的事情。这就是代理服务器、NAT、中继或其他设备所发生的情况。

应用层不应该以任何方式依赖于IP地址。特别是,IP地址不意味着是网络连接一端的标识符以外的任何标识符。一旦连接被关闭,(同一用户的)IP地址就会发生变化。