How can I get the IP address from the user client in C#?

Friday, June 1, 2012 by Nate Bross

Someone asked on Stack Overflow:

I’m using this code that I found in Get public IP using DynDNS and WebRequest C#

to get the IP address. But I just get the IP Address from the server and what I need is the IP address from the user that is connected to my web application.

String direction = "";
WebRequest request = WebRequest.Create("http://checkip.dyndns.org/");
using (WebResponse response = request.GetResponse())
using (StreamReader stream = new StreamReader(response.GetResponseStream()))
{
    direction = stream.ReadToEnd();
}

//Search for the ip in the html
int first = direction.IndexOf("Address: ") + 9;
int last = direction.LastIndexOf("</body>");
direction = direction.Substring(first, last - first);

I posted the following answer, which was chosen as the accepted answer and received 2 upvotes:

If you are running a web app, and you want your “client’s” IP, you need to use the UserHostAddress.

var userAddress = HttpContext.Current.Request.UserHostAddress;

Originally posted on Stack Overflow — 2 upvotes (accepted answer). Licensed under CC BY-SA.