How to Get Client Ip Address in ASP.NET Core

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

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;

ASP .NET Core: Get User IP Address

Get client user IP address

var remoteIpAddress = Request.HttpContext.Connection.RemoteIpAddress.ToString();

Client IP address can be retrieved via HttpContext.Connection object.

Property RemoteIpAddress is the client IP address. The returned object (System.Net.IpAddress) can be used to check whether it is IPV4 or IPV6 address.

For example, if you get a result like ::1, this is the IPv6 format

Get User's Ip address using ASP.NET Core 3.1 Web API

In the controller you can call :

var remoteIpAddress = HttpContext.Connection.RemoteIpAddress.ToString();

You could have obtained an answer by a simple Google search.

Get Correct Client IP Address with .Net Core

It's possible you may not have added the UseForwardedHeaders middleware.

Add UseForwardedHeaders middleware to get the client IP address

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

Then:

string ip = _httpContext.Connection.RemoteIpAddress.ToString();

Because when the application is run on IIS, IIS forward HTTP requests to the Kestrel and always you get local IP address instead of Client IP

Getting client IP address in dotnet core web api ::ffff:127.0.0.1

It looks like you're hosting your application on IIS, behind firewall, NAT, Apache routes, etc. Check the list of headers you're getting in the request. IP address might be one of them in case request have been forwarded. You may want to take a look on this answer as well: https://stackoverflow.com/a/62060533/9890829

How to get a user's client IP address in ASP.NET?

As others have said you can't do what you are asking. If you describe the problem you are trying to solve maybe someone can help?

E.g.

• are you trying to uniquely identify your users?
• Could you use a cookie, or the session ID perhaps instead of the IP address?

Edit The address you see on the server shouldn't be the ISP's address, as you say that would be a huge range. The address for a home user on broadband will be the address at their router, so every device inside the house will appear on the outside to be the same, but the router uses NAT to ensure that traffic is routed to each device correctly. For users accessing from an office environment the address may well be the same for all users. Sites that use IP address for ID run the risk of getting it very wrong - the examples you give are good ones and they often fail. For example my office is in the UK, the breakout point (where I "appear" to be on the internet) is in another country where our main IT facility is, so from my office my IP address appears to be not in the UK. For this reason I can't access UK only web content, such as the BBC iPlayer). At any given time there would be hundreds, or even thousands, of people at my company who appear to be accessing the web from the same IP address.

When you are writing server code you can never be sure what the IP address you see is referring to. Some users like it this way. Some people deliberately use a proxy or VPN to further confound you.

When you say your machine address is different to the IP address shown on StackOverflow, how are you finding out your machine address? If you are just looking locally using ipconfig or something like that I would expect it to be different for the reasons I outlined above. If you want to double check what the outside world thinks have a look at whatismyipaddress.com/.

This Wikipedia link on NAT will provide you some background on this.

Get client's IP address in ASP.NET Core 2.2

Inject IHttpContextAccessor

And put the below snippet

var result = string.Empty;

 //first try to get IP address from the forwarded header
                if (_httpContextAccessor.HttpContext.Request.Headers != null)
                {
                    //the X-Forwarded-For (XFF) HTTP header field is a de facto standard for identifying the originating IP address of a client
                    //connecting to a web server through an HTTP proxy or load balancer

                    var forwardedHeader = _httpContextAccessor.HttpContext.Request.Headers["X-Forwarded-For"];
                    if (!StringValues.IsNullOrEmpty(forwardedHeader))
                        result = forwardedHeader.FirstOrDefault();
                }

                //if this header not exists try get connection remote IP address
                if (string.IsNullOrEmpty(result) && _httpContextAccessor.HttpContext.Connection.RemoteIpAddress != null)
                    result = _httpContextAccessor.HttpContext.Connection.RemoteIpAddress.ToString();

I think it may work.

How to get client ip address in MVC

You can get the I.P address like this in your Controller method:

If the client machine is behind a proxy server, we can check for the variable HTTP_X_FORWARDED_FOR:

string ip;
ip =  System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if (string.IsNullOrEmpty(ip))
{
    ip =  System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}

If the IP Address is not found in the HTTP_X_FORWARDED_FOR server variable, it means that it is not using any Proxy Server and hence the IP Address is now checked in the REMOTE_ADDR server variable.

Note: On your local machine, the I.P address will be shown as ::1 which is an IPV6 loopback address (i.e. localhost). An IPV4 address would be 127.0.0.1.

This is because in such case the Client and Server both are the same machine. When the application is deployed on the server, then the result will be different.

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