ASP.NET Core: How to get remote IP address?

Just try this:

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.

I know that this post is old but I came here looking for the same question and finnaly I did this:

On project.json add dependency:

"Microsoft.AspNetCore.HttpOverrides": "1.0.0"

On 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 got the ip like this:

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 may be because:

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)