How to get Client IP address in ASP.NET Core 2.1

Question

I'm working on ASP.Net Core 2.1 with Angular Template provided by Microsoft Visual Studio 2017. My Client App is working fine. After competition of User Authentication, I want to start User Session Management in which I store client user IP Address. I've already searched for this on the internet but so far not found any solution.

Below are some ref links which I already visited:

How do I get client IP address in ASP.NET CORE?

Get Client IP Address in ASP.NET Core 2.0

Get a user remote IP Address in ASP.Net Core

In my ValuesController.cs I also tried below code:

private IHttpContextAccessor _accessor;

public ValuesController(IHttpContextAccessor accessor)
{
    _accessor = accessor;
}

public IEnumerable<string> Get()
{
    var ip = Request.HttpContext.Connection.RemoteIpAddress.ToString();
    return new string[] { ip, "value2" };
}

wherein ip variable I get null value and getting this error

Request.HttpContext.Connection.RemoteIpAddress.Address threw an exception of Type 'System.Net.Sockets.SocketException'

Can you please let me know how to get client IP address in ASP.NET Core 2.1.

Is it null as well if you use _accessor.HttpContext.Connection.RemoteIpAddress? — Camilo Terevinto
– Camilo Terevinto, Commented Jun 30, 2018 at 16:01
Are you trying to identify a user by an IP address? That is unreliable. Two people on your site connecting to public wifi at a library, coffee shop, hotel, etc will have the same IP address. — Crowcoder
– Crowcoder, Commented Jun 30, 2018 at 17:02
How are you calling this code? You should be able to do just HttpContext.Connection.RemoteIpAddress in a controller. No need to go through Request or to use a HttpContextAccessor there. — poke
– poke, Commented Jun 30, 2018 at 17:07
how the remote ip address is resolved has a lot to do with the specifics of the hosting environment learn.microsoft.com/en-us/aspnet/core/host-and-deploy/… — Joe Audette
– Joe Audette, Commented Jun 30, 2018 at 17:15

huysentruitw · Accepted Answer · 2018-10-22 17:19:31Z

23

In your Startup.cs, make sure you have a method to ConfigureServices, passing in the IServiceCollection, then register IHttpContextAccessor as a singleton as follows:

public void ConfigureServices(IServiceCollection services)
{
    services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
}

After registering the IHttpContextAccessor in your Startup.cs file, you can inject the IHttpContextAccessor in your controller class and use it like so:

private IHttpContextAccessor _accessor;

public ValuesController(IHttpContextAccessor accessor)
{
    _accessor = accessor;
}

public IEnumerable<string> Get()
{
    var ip = _accessor.HttpContext?.Connection?.RemoteIpAddress?.ToString();
    return new string[] { ip, "value2" };
}

edited Oct 22, 2018 at 17:19

huysentruitw

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answered Jul 9, 2018 at 12:11

zdub

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3 Comments

Mrunal Over a year ago

ToString value is "::1" for me while running on localhost machine.

ebhh2001 Over a year ago

What is the purpose of value2 in return new string[] { ip, "value2" };?

zdub Over a year ago

value2 is simply returned here to match the code that was provided in the initial question and does not serve any purpose for retrieving the client IP. This same block could also be written as follows: public string Get() { return _accessor.HttpContext?.Connection?.RemoteIpAddress?.ToString(); }

pomo_mondreganto · Accepted Answer · 2018-10-31 18:01:13Z

22

It's possible to use the following code:

services.Configure<ForwardedHeadersOptions>(options =>
{
    options.ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto;
});

string remoteIpAddress = HttpContext.Connection.RemoteIpAddress.MapToIPv4().ToString();
if (Request.Headers.ContainsKey("X-Forwarded-For"))
    remoteIpAddress = Request.Headers["X-Forwarded-For"];

edited Oct 31, 2018 at 18:01

pomo_mondreganto

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answered Oct 31, 2018 at 17:23

giox

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4 Comments

Hossein Over a year ago

Is there any difference bewtween your answer and using: app.UseForwardedHeaders(new ForwardedHeadersOptions{ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto}); ?

Shojaeddin Over a year ago

@desmati, I did not get real ip address of client if I do not check Request.Headers.ContainsKey("X-Forwarded-For") , even if i only use app.UseForwardedHeaders(new ForwardedHeadersOptions{ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto});

vishal shah Over a year ago

@Liam, I have the same issue. According to article learn.microsoft.com/en-us/aspnet/core/host-and-deploy/… , it should work directly from context.Connection.RemoteIpAddress. Unfortunately, I also have to fetch client ip from context.Request.Headers[_xForwardedForHeader].

Pelle Ravn Over a year ago

The "x-forwarded-for" header can also contain the port the website it is being hosted on (e.g. 10.0.120:6529). To remove this (assuming it's an IPv4 address), you could use the following instead to remove it: remoteIpAddress = Request.Headers["X-Forwarded-For"].ToString().Split(":")[0];

Yush0 · Accepted Answer · 2018-10-19 06:34:07Z

7

If your Kestrel sits behind a reverse proxy like IIS make sure to forward the headers containing the client IP.
This goes into startup:

app.UseForwardedHeaders(new ForwardedHeadersOptions{ForwardedHeaders = ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto});

answered Oct 19, 2018 at 6:34

Yush0

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Comments

Avinash Barnwal · Accepted Answer · 2018-07-02 08:59:05Z

If I use the Binding Address Localhost:5000 then the IP is returned as "::1" (Localhost IPv6 address). If I bind my Webapi on the IP Address and try to reach it from another client computer, I get Client's IP Address in API Response. There is no need for HTTPAccessor i believe. As per the documentation https://learn.microsoft.com/en-us/aspnet/core/host-and-deploy/proxy-load-balancer?view=aspnetcore-2.1, the HttpContext.Connection.RemoteIpAddress is set by XForwardedFor header.

If your application (WEBAPI) is behind a NGINX/Apache Reverse Proxy, you should enable those REV Proxies to send X-Forwarded-For Header address which contains the real IP address of the Client, if you don't setup or process X-Forwarded-For Header, then you would always get either Nulls or Reverse-Proxy Server's IP Address.

The GetHostEntry above has no relation to the HTTP Request directly. GetHostEntry is just a NSLookup tool for API programming and it just tells you the IP Addresses reachable for a particular name, but doesn't tell you from which IP address the Request came to WebApi.

Hope that helps

Emre SOLUĞAN · Accepted Answer · 2019-04-02 12:47:09Z

2

Try this code,

var ipAddress = HttpContext.Connection.RemoteIpAddress;

And if you have another computer in same LAN, try to connect with this pc but use user ip instead of localhost. Otherwise you will get always ::1 result.

answered Apr 2, 2019 at 12:47

Emre SOLUĞAN

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Comments

Ahmer Ali Ahsan · Accepted Answer · 2018-07-19 06:55:30Z

-2

After spending some time on searching I found my own question answer. Here I'm also sharing the source link from where I can get my answer and detail explanation for how to query a server to obtain the family addresses and the IP addresses it supports.

Code:

IPHostEntry heserver = Dns.GetHostEntry(Dns.GetHostName());
var ip = heserver.AddressList[2].ToString();

Source

Here is my another Question: How to access server variables in ASP.Net Core 2.x Hope this helps for you all.

edited Jul 19, 2018 at 6:55

answered Jul 1, 2018 at 12:51

Ahmer Ali Ahsan

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6 Comments

Pac0 Over a year ago

I am not sure to understand. It is interesting, but It seems to me that your answer is not giving the client ip address from the client that is querying your server, which was your question.

Ahmer Ali Ahsan Over a year ago

What you mean to say that above code didn't return client ip address? May be you re right coz I m using localhost and maybe its return me a server ip address.

Pac0 Over a year ago

Yes, it seems to be addresses from the server (the Host of the application), corresponding to the server's DNS information, so probably completely unrelated to the client.

Ahmer Ali Ahsan Over a year ago

@Pac0 so what can I do now? How can I get Client Ip Address?

Pac0 Over a year ago

I still don't know, unfortunately. In all the situations I know, HttpContext.Connection.RemoteIpAddress is the way to go, but for some reason, it doesn't work for you apparently.

|

tomerpacific · Accepted Answer · 2019-02-24 13:19:45Z

-6

This works for me on .Net Core 2.2:

IPHostEntry heserver = Dns.GetHostEntry(Dns.GetHostName());

var ipAddress = heserver.AddressList.ToList().Where(p => p.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork).FirstOrDefault().ToString();

edited Feb 24, 2019 at 13:19

tomerpacific

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answered Feb 24, 2019 at 11:25

Gopal

1

2 Comments

ProgrammingLlama Over a year ago

Can you explain how this provides the client IP address?

Randy Over a year ago

That provides the server IP and not the client IP

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