How do I get client IP address in ASP NET CORE

Question

Can you please let me know how to get client IP address in ASP NET when using MVC 6  Request ServerVariables  REMOTE ADDR   does not work

User · Answer

To get IP address and hostname in  NET Core  put the following code in the controller  var addlist   Dns GetHostEntry Dns GetHostName     string GetHostName   addlist HostName ToString    string GetIPV6   addlist AddressList 0  ToString    string GetIPV4   addlist AddressList 1  ToString

User · Answer

You can use the IHttpConnectionFeature for getting this information   var remoteIpAddress   httpContext GetFeature lt IHttpConnectionFeature gt     RemoteIpAddress

User · Answer

This works for me  DotNetCore 2 1    HttpGet  public string Get          var remoteIpAddress   HttpContext Connection RemoteIpAddress      return remoteIpAddress ToString

User · Answer

Running  NET core  3 1 4  on IIS behind a Load balancer did not work with other suggested solutions  Manually reading the X-Forwarded-For header does  IPAddress ip  var headers   Request Headers ToList    if  headers Exists  kvp    gt  kvp Key     quot X-Forwarded-For quot             when running behind a load balancer you can expect this header     var header   headers First  kvp    gt  kvp Key     quot X-Forwarded-For quot   Value ToString        ip   IPAddress Parse header     else          this will always have a value  running locally in development won t have the header      ip   Request HttpContext Connection RemoteIpAddress

User · Answer

I found that  some of you found that the IP address you get is    1 or 0 0 0 1  This is the problem because of you try to get IP from your own machine  and the confusion of C  that try to return IPv6   So  I implement the answer from  Johna  https   stackoverflow com a 41335701 812720  and  David  https   stackoverflow com a 8597351 812720   Thanks to them   and here to solution    add Microsoft AspNetCore HttpOverrides Package in your References  Dependencies Packages  add this line in Startup cs  public void Configure IApplicationBuilder app  IHostingEnvironment env           your current code         start code to add        to get ip address     app UseForwardedHeaders new ForwardedHeadersOptions           ForwardedHeaders   ForwardedHeaders XForwardedFor   ForwardedHeaders XForwardedProto                end code to add     to get IPAddress  use this code in any of your Controller cs  IPAddress remoteIpAddress   Request HttpContext Connection RemoteIpAddress  string result       if  remoteIpAddress    null           If we got an IPV6 address  then we need to ask the network for the IPV4 address         This usually only happens when the browser is on the same machine as the server      if  remoteIpAddress AddressFamily    System Net Sockets AddressFamily InterNetworkV6                remoteIpAddress   System Net Dns GetHostEntry remoteIpAddress  AddressList  First x   gt  x AddressFamily    System Net Sockets AddressFamily InterNetwork             result   remoteIpAddress ToString         and now you can get IPv4 address from remoteIpAddress or result

User · Answer

In ASP NET 2 1  In StartUp cs Add This Services   services AddHttpContextAccessor    services TryAddSingleton lt IActionContextAccessor  ActionContextAccessor gt       and then do 3 step    Define a variable in your MVC controller  private IHttpContextAccessor  accessor   DI into the controller s constructor  public SomeController IHttpContextAccessor accessor         accessor   accessor     Retrieve the IP Address   accessor HttpContext Connection RemoteIpAddress ToString      This is how it is done

User · Answer

In my case  I have DotNet Core 2 2 Web App running on DigitalOcean with docker and nginx as reverse proxy  With this code in Startup cs I can get the client IP  app UseForwardedHeaders new ForwardedHeadersOptions                       ForwardedHeaders   ForwardedHeaders All              RequireHeaderSymmetry   false              ForwardLimit   null              KnownNetworks     new IPNetwork IPAddress Parse    ffff 172 17 0 1    104                    ffff 172 17 0 1 was the ip that I was getting before using   Request HttpContext Connection RemoteIpAddress ToString

User · Answer

Running ASP NET Core 2 1 behind a Traefik reverse Proxy on Ubuntu  I need to set its gateway IP in KnownProxies after installing the official Microsoft AspNetCore HttpOverrides package          var forwardedOptions   new ForwardedHeadersOptions               ForwardedHeaders   ForwardedHeaders XForwardedFor                     forwardedOptions KnownProxies Add IPAddress Parse  192 168 3 1             app UseForwardedHeaders forwardedOptions     According to the documentation  this is required if the reverse proxy is not running on localhost  The docker-compose yml of Traefik has assigned a static IP address   networks    my-docker-network      ipv4 address  192 168 3 2   Alternatively  it should be enough to make sure a known network is defined here to specify its gateway in  NET Core

User · Answer

First  in  Net Core 1 0  Add using Microsoft AspNetCore Http Features  to the controller Then inside the relevant method    var ip   HttpContext Features Get lt IHttpConnectionFeature gt     RemoteIpAddress  ToString      I read several other answers which failed to compile because it was using a lowercase httpContext  leading the VS to add using Microsoft AspNetCore Http  instead of the appropriate using  or with HttpContext  compiler is also mislead

User · Answer

Some fallback logic can be added to handle the presence of a Load Balancer     Also  through inspection  the X-Forwarded-For header happens to be set anyway even without a Load Balancer  possibly because of additional Kestrel layer     public string GetRequestIP bool tryUseXForwardHeader   true        string ip   null          todo support new  Forwarded  header  2014  https   en wikipedia org wiki X-Forwarded-For         X-Forwarded-For  csv list    Using the First entry in the list seems to work        for 99  of cases however it has been suggested that a better  although tedious         approach might be to read each IP from right to left and use the first public IP         http   stackoverflow com a 43554000 538763            if  tryUseXForwardHeader          ip   GetHeaderValueAs lt string gt   X-Forwarded-For   SplitCsv   FirstOrDefault            RemoteIpAddress is always null in DNX RC1 Update1  bug       if  ip IsNullOrWhitespace    amp  amp   httpContextAccessor HttpContext  Connection  RemoteIpAddress    null          ip    httpContextAccessor HttpContext Connection RemoteIpAddress ToString         if  ip IsNullOrWhitespace            ip   GetHeaderValueAs lt string gt   REMOTE ADDR             httpContextAccessor HttpContext  Request  Host this is the local host       if  ip IsNullOrWhitespace            throw new Exception  Unable to determine caller s IP          return ip     public T GetHeaderValueAs lt T gt  string headerName        StringValues values       if   httpContextAccessor HttpContext  Request  Headers  TryGetValue headerName  out values     false                string rawValues   values ToString         writes out as Csv when there are multiple           if   rawValues IsNullOrWhitespace                return  T Convert ChangeType values ToString    typeof T              return default T      public static List lt string gt  SplitCsv this string csvList  bool nullOrWhitespaceInputReturnsNull   false        if  string IsNullOrWhiteSpace csvList           return nullOrWhitespaceInputReturnsNull   null   new List lt string gt          return csvList          TrimEnd               Split               AsEnumerable lt string gt             Select s   gt  s Trim             ToList       public static bool IsNullOrWhitespace this string s        return String IsNullOrWhiteSpace s       Assumes  httpContextAccessor was provided through DI

User · Answer

var remoteIpAddress   HttpContext Features Get lt IHttpConnectionFeature gt     RemoteIpAddress

User · Answer

try this    var host   Dns GetHostEntry Dns GetHostName             foreach  var ip in host AddressList                        if  ip AddressFamily    AddressFamily InterNetwork                                 ipAddress   ip ToString

User · Answer

The API has been updated  Not sure when it changed but according to Damien Edwards in late December  you can now do this   var remoteIpAddress   request HttpContext Connection RemoteIpAddress

User · Answer

In project json add a dependency to    Microsoft AspNetCore HttpOverrides    1 0 0    In Startup cs  in the Configure   method add     app UseForwardedHeaders new ForwardedHeadersOptions                       ForwardedHeaders   ForwardedHeaders XForwardedFor               ForwardedHeaders XForwardedProto                 And  of course   using Microsoft AspNetCore HttpOverrides    Then  I could get the ip by using   Request HttpContext Connection RemoteIpAddress   In my case  when debugging in VS I got always IpV6 localhost  but when deployed on an IIS I got always the remote IP   Some useful links  How do I get client IP address in ASP NET CORE  and RemoteIpAddress is always null  The   1 is maybe because of      Connections termination at IIS  which then forwards to Kestrel  the v next web server  so connections to the web server are indeed from localhost   https   stackoverflow com a 35442401 5326387

[c#] How do I get client IP address in ASP.NET CORE?

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