How to Find Client IP Address using ASP.net?

In this article we will see how to find the IP address of the client using asp.net. For getting the IP Address of the client write the following code.

using System;

using System.Net; //Add Namespace

public partial class IpAddress : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

               //Get The Visitor Ip Address

               String IpAddress = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

               IF (IpAddress == null || IpAddress == String.Empty) //if HTTP_X_FORWARDED_FOR is null

               {

                               //we can use REMOTE_ADDR

                               IpAddress = Request.ServerVariables["REMOTE_ADDR"];

               }

               //Get the Host Name

               String HostName = Dns.GetHostName();

               //Get The Ip Host Entry

               IPHostEntry ipHostEntries = Dns.GetHostEntry(HostName);

               //Get The Ip Address

               IPAddress[] arrayOfIpAddress = ipHostEntries.AddressList;

               //Get The Lan Ip Address

               String strLanIpAddress = arrayOfIpAddress[arrayOfIpAddress.Length - 1].ToString();

               Response.Write("Visitor Ip Address : " + IpAddress

                               + "<br/> Your Host Name : " + HostName

                               + "<br/> Your Ip Address : " + strLanIpAddress);

    }

}

For getting the IP Address of the client we have to make a request to http://www.whatismyip.org. Write the following code in Page_Load event.

System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create("http://www.whatismyip.org");

            System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();

            String strExternalIP = string.Empty;

            using (System.IO.StreamReader reader = new StreamReader(response.GetResponseStream()))

            {

                strExternalIP = reader.ReadToEnd();

                reader.Close();

            }

            Response.Write(strExternalIP.ToString());