`UserHostAddress`

This method gets the IP address of the current request. It uses the UserHostAddress property in the ASP.NET framework.

Property notes

UserHostAddress is the easiest way to get a string representation of the IP address. We can use this string for recording information about requests.

This example presents the Application_BeginRequest method, which is executed every time a user visits the web site. You can add it by going to Add, and then Global Application Class.

Detail In Application_BeginRequest, we get the current HttpRequest, then access the UserHostAddress string property.

Finally We write the string value to the output. And we complete the request by calling CompleteRequest.

using System;
using System.Web;

namespace WebApplication1
{
    public class Global : HttpApplication
    {
        protected void Application_BeginRequest(object sender, EventArgs e)
        {
            // Get request.
            HttpRequest request = base.Request;

            // Get UserHostAddress property.
            string address = request.UserHostAddress;

            // Write to response.
            base.Response.Write(address);

            // Done.
            base.CompleteRequest();
        }
    }
}
127.0.0.1

The IP address

I ran the program on the localhost server. In this case, the connection is only a local connection, which means my local address was the IP address returned.

Note If this code was run on a remote server, the IP address for my internet connection would be returned.

Summary

We acquired the current IP address of the user. This yields a string with numbers separated by periods. It can be used in a Dictionary if you need to record or special-case users by IP.