How can I get the client s IP address in ASP NET MVC

Question

I m totally new to the ASP NET MVC stack  and I was wondering what happened to the simple Page object and the Request ServerVariables object   Basically  I want to to pull out the client PC s IP address  but I fail to understand how the current MVC structure has changed all of this   As far as I can understand  most of the variable objects has been replaced by the HttpRequest variants   Anybody care to share some resources  There is really a sea of stuff to learn in the ASP NET MVC world      For example  I have a static class with this current function  How do I get the same result using ASP NET MVC   public static int getCountry Page page        return getCountryFromIP getIPAddress page       public static string getIPAddress Page page        string szRemoteAddr   page Request ServerVariables  REMOTE ADDR        string szXForwardedFor   page Request ServerVariables  X FORWARDED FOR        string szIP            if  szXForwardedFor    null                szIP   szRemoteAddr            else               szIP   szXForwardedFor           if  szIP IndexOf       gt  0                        string    arIPs   szIP Split                    foreach  string item in arIPs                                if   isPrivateIP item                                         return item                                                      return szIP      And how do I call this function from the controller page

User · Accepted Answer

The simple answer is to use the HttpRequest.UserHostAddress property.

Example: From within a Controller:

using System;
using System.Web.Mvc;

namespace Mvc.Controllers
{
    public class HomeController : ClientController
    {
        public ActionResult Index()
        {
            string ip = Request.UserHostAddress;

            ...
        }
    }
}

Example: From within a helper class:

using System.Web;

namespace Mvc.Helpers
{
    public static class HelperClass
    {
        public static string GetIPHelper()
        {
            string ip = HttpContext.Current.Request.UserHostAddress;
            ..
        }
    }
}

BUT, if the request has been passed on by one, or more, proxy servers then the IP address returned by HttpRequest.UserHostAddress property will be the IP address of the last proxy server that relayed the request.

Proxy servers MAY use the de facto standard of placing the client's IP address in the X-Forwarded-For HTTP header. Aside from there is no guarantee that a request has a X-Forwarded-For header, there is also no guarantee that the X-Forwarded-For hasn't been SPOOFED.

Original Answer

Request.UserHostAddress

The above code provides the Client's IP address without resorting to looking up a collection. The Request property is available within Controllers (or Views). Therefore instead of passing a Page class to your function you can pass a Request object to get the same result:

public static string getIPAddress(HttpRequestBase request)
{
    string szRemoteAddr = request.UserHostAddress;
    string szXForwardedFor = request.ServerVariables["X_FORWARDED_FOR"];
    string szIP = "";

    if (szXForwardedFor == null)
    {
        szIP = szRemoteAddr;
    }
    else
    {
        szIP = szXForwardedFor;
        if (szIP.IndexOf(",") > 0)
        {
            string [] arIPs = szIP.Split(',');

            foreach (string item in arIPs)
            {
                if (!isPrivateIP(item))
                {
                    return item;
                }
            }
        }
    }
    return szIP;
}

User · Answer

How I account for my site being behind an Amazon AWS Elastic Load Balancer  ELB    public class GetPublicIp             lt summary gt          account for possbility of ELB sheilding the public IP address          lt  summary gt           lt returns gt  lt  returns gt      public static string Execute             try               Console WriteLine string Join      new List lt object gt                        HttpContext Current Request UserHostAddress                      HttpContext Current Request Headers  X-Forwarded-For                        HttpContext Current Request Headers  REMOTE ADDR                                                  var ip   HttpContext Current Request UserHostAddress              if  HttpContext Current Request Headers  X-Forwarded-For      null                    ip   HttpContext Current Request Headers  X-Forwarded-For                    Console WriteLine ip     X-Forwarded-For                              else if  HttpContext Current Request Headers  REMOTE ADDR      null                    ip   HttpContext Current Request Headers  REMOTE ADDR                    Console WriteLine ip     REMOTE ADDR                              return ip                    catch  Exception ex                Console Error WriteLine ex Message                     return null

User · Answer

In a class you might call it like this   public static string GetIPAddress HttpRequestBase request         string ip      try               ip   request ServerVariables  HTTP X FORWARDED FOR            if   string IsNullOrEmpty ip                         if  ip IndexOf       gt  0                                string   ipRange   ip Split                       int le   ipRange Length - 1                  ip   ipRange le                           else                       ip   request UserHostAddress                  catch   ip   null         return ip       I used this in a razor app with great results

User · Answer

I had trouble using the above  and I needed the IP address from a controller  I used the following in the end   System Web HttpContext Current Request UserHostAddress

User · Answer

Request ServerVariables  REMOTE ADDR   should work - either directly in a view or in the controller action method body  Request is a property of Controller class in MVC  not Page    It is working   but you have to publish on a real IIS not the virtual one

User · Answer

A lot of the code here was very helpful  but I cleaned it up for my purposes and added some tests   Here s what I ended up with   using System  using System Linq  using System Net  using System Web   public class RequestHelpers       public static string GetClientIpAddress HttpRequestBase request                try                       var userHostAddress   request UserHostAddress                  Attempt to parse   If it fails  we catch below and return  0 0 0 0                 Could use TryParse instead  but I wanted to catch all exceptions             IPAddress Parse userHostAddress                var xForwardedFor   request ServerVariables  X FORWARDED FOR                 if  string IsNullOrEmpty xForwardedFor                   return userHostAddress                  Get a list of public ip addresses in the X FORWARDED FOR variable             var publicForwardingIps   xForwardedFor Split      Where ip   gt   IsPrivateIpAddress ip   ToList                    If we found any  return the last one  otherwise return the user host address             return publicForwardingIps Any     publicForwardingIps Last     userHostAddress                    catch  Exception                           Always return all zeroes for any failure  my calling code expects it              return  0 0 0 0                        private static bool IsPrivateIpAddress string ipAddress                   http   en wikipedia org wiki Private network            Private IP Addresses are               24-bit block  10 0 0 0 through 10 255 255 255             20-bit block  172 16 0 0 through 172 31 255 255             16-bit block  192 168 0 0 through 192 168 255 255             Link-local addresses  169 254 0 0 through 169 254 255 255  http   en wikipedia org wiki Link-local address           var ip   IPAddress Parse ipAddress           var octets   ip GetAddressBytes             var is24BitBlock   octets 0     10          if  is24BitBlock  return true     Return to prevent further processing          var is20BitBlock   octets 0     172  amp  amp  octets 1   gt   16  amp  amp  octets 1   lt   31          if  is20BitBlock  return true     Return to prevent further processing          var is16BitBlock   octets 0     192  amp  amp  octets 1     168          if  is16BitBlock  return true     Return to prevent further processing          var isLinkLocalAddress   octets 0     169  amp  amp  octets 1     254          return isLinkLocalAddress            And here are some NUnit tests against that code  I m using Rhino Mocks to mock the HttpRequestBase  which is the M lt HttpRequestBase gt  call below    using System Web  using NUnit Framework  using Rhino Mocks  using Should    TestFixture  public class HelpersTests   TestBase       HttpRequestBase  httpRequest       private const string XForwardedFor    X FORWARDED FOR       private const string MalformedIpAddress    MALFORMED       private const string DefaultIpAddress    0 0 0 0       private const string GoogleIpAddress    74 125 224 224       private const string MicrosoftIpAddress    65 55 58 201       private const string Private24Bit    10 0 0 0       private const string Private20Bit    172 16 0 0       private const string Private16Bit    192 168 0 0       private const string PrivateLinkLocal    169 254 0 0         SetUp      public void Setup                  httpRequest   M lt HttpRequestBase gt                 TearDown      public void Teardown                  httpRequest   null              Test      public void PublicIpAndNullXForwardedFor Returns CorrectIp                    Arrange          httpRequest Stub x   gt  x UserHostAddress  Return GoogleIpAddress            httpRequest Stub x   gt  x ServerVariables XForwardedFor   Return null               Act         var ip   RequestHelpers GetClientIpAddress  httpRequest               Assert         ip ShouldEqual GoogleIpAddress               Test      public void PublicIpAndEmptyXForwardedFor Returns CorrectIp                    Arrange          httpRequest Stub x   gt  x UserHostAddress  Return GoogleIpAddress            httpRequest Stub x   gt  x ServerVariables XForwardedFor   Return string Empty               Act         var ip   RequestHelpers GetClientIpAddress  httpRequest               Assert         ip ShouldEqual GoogleIpAddress               Test      public void MalformedUserHostAddress Returns DefaultIpAddress                    Arrange          httpRequest Stub x   gt  x UserHostAddress  Return MalformedIpAddress            httpRequest Stub x   gt  x ServerVariables XForwardedFor   Return null               Act         var ip   RequestHelpers GetClientIpAddress  httpRequest               Assert         ip ShouldEqual DefaultIpAddress               Test      public void MalformedXForwardedFor Returns DefaultIpAddress                    Arrange          httpRequest Stub x   gt  x UserHostAddress  Return GoogleIpAddress            httpRequest Stub x   gt  x ServerVariables XForwardedFor   Return MalformedIpAddress               Act         var ip   RequestHelpers GetClientIpAddress  httpRequest               Assert         ip ShouldEqual DefaultIpAddress               Test      public void SingleValidPublicXForwardedFor Returns XForwardedFor                    Arrange          httpRequest Stub x   gt  x UserHostAddress  Return GoogleIpAddress            httpRequest Stub x   gt  x ServerVariables XForwardedFor   Return MicrosoftIpAddress               Act         var ip   RequestHelpers GetClientIpAddress  httpRequest               Assert         ip ShouldEqual MicrosoftIpAddress               Test      public void MultipleValidPublicXForwardedFor Returns LastXForwardedFor                    Arrange          httpRequest Stub x   gt  x UserHostAddress  Return GoogleIpAddress            httpRequest Stub x   gt  x ServerVariables XForwardedFor   Return GoogleIpAddress         MicrosoftIpAddress               Act         var ip   RequestHelpers GetClientIpAddress  httpRequest               Assert         ip ShouldEqual MicrosoftIpAddress               Test      public void SinglePrivateXForwardedFor Returns UserHostAddress                    Arrange          httpRequest Stub x   gt  x UserHostAddress  Return GoogleIpAddress            httpRequest Stub x   gt  x ServerVariables XForwardedFor   Return Private24Bit               Act         var ip   RequestHelpers GetClientIpAddress  httpRequest               Assert         ip ShouldEqual GoogleIpAddress               Test      public void MultiplePrivateXForwardedFor Returns UserHostAddress                    Arrange          httpRequest Stub x   gt  x UserHostAddress  Return GoogleIpAddress           const string privateIpList   Private24Bit         Private20Bit         Private16Bit         PrivateLinkLocal           httpRequest Stub x   gt  x ServerVariables XForwardedFor   Return privateIpList               Act         var ip   RequestHelpers GetClientIpAddress  httpRequest               Assert         ip ShouldEqual GoogleIpAddress               Test      public void MultiplePublicXForwardedForWithPrivateLast Returns LastPublic                    Arrange          httpRequest Stub x   gt  x UserHostAddress  Return GoogleIpAddress           const string privateIpList   Private24Bit         Private20Bit         MicrosoftIpAddress         PrivateLinkLocal           httpRequest Stub x   gt  x ServerVariables XForwardedFor   Return privateIpList               Act         var ip   RequestHelpers GetClientIpAddress  httpRequest               Assert         ip ShouldEqual MicrosoftIpAddress

[c#] How can I get the client's IP address in ASP.NET MVC?

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