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How to get Client or visitor IP Address:: Despite multiple tries Didn't get solution: Below what I tried:

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

{

    protected void Page_Load(object sender, EventArgs e)

    {

        string ipAddress33 = Request.UserHostAddress.ToString();

        string strHostName = System.Net.Dns.GetHostName();

        string clientIPAddress22 = System.Net.Dns.GetHostAddresses(strHostName).GetValue(1).ToString();

        Response.Write("System.Net.Dns.GetHostAddresses(strHostName).GetValue(1).ToString(); : " + clientIPAddress22 + "<br />");

        string ipaddress;

        string IP = Request.UserHostAddress;

        string clientIPAddress = this.Page.Request.ServerVariables["REMOTE_ADDR"];

        string IP2 = Environment.GetEnvironmentVariable("CLIENTNAME");



        ipaddress = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

        if (ipaddress == "" || ipaddress == null)

            ipaddress = Request.ServerVariables["REMOTE_ADDR"];

        Response.Write("Request.ServerVariables['HTTP_X_FORWARDED_FOR'] : " + ipaddress + "<br />");

        Response.Write("Request.UserHostAddress.ToString() : " + ipAddress33 + "<br />");



        string stringIpAddress;

        stringIpAddress = Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

        if (stringIpAddress == null) //may be the HTTP_X_FORWARDED_FOR is null

        {

            stringIpAddress = Request.ServerVariables["REMOTE_ADDR"];//we can use REMOTE_ADDR

        }

        Response.Write("Request.ServerVariables['REMOTE_ADDR'] : " + stringIpAddress + "<br />");



        //Get the Host Name

        string stringHostName = Dns.GetHostName();

        //Get The Ip Host Entry

        IPHostEntry ipHostEntries = Dns.GetHostEntry(stringHostName);

        //Get The Ip Address From The Ip Host Entry Address List

        IPAddress arrIpAddress = ipHostEntries.AddressList;

        Response.Write("Dns.GetHostName():  " + arrIpAddress[arrIpAddress.Length - 1].ToString());



    }



}

This is the results I got:

System.Net.Dns.GetHostAddresses(strHostName).GetValue(1).ToString(); : 190.80.90.75

Request.ServerVariables['HTTP_X_FORWARDED_FOR'] : 190.80.90.225

Request.UserHostAddress.ToString() : 190.80.90.225

Request.ServerVariables['REMOTE_ADDR'] : 190.80.90.225

Dns.GetHostName(): 190.80.90.75

Which is not the correct IP address of the visitor.

according to this answer you can use this :

  protected void GetUser_IP()

{

    string VisitorsIPAddr = string.Empty;

    if (HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null)

    {

        VisitorsIPAddr = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();

    }

    else if (HttpContext.Current.Request.UserHostAddress.Length != 0)

    {

        VisitorsIPAddr = HttpContext.Current.Request.UserHostAddress;

    }

    uip.Text = "Your IP is: " + VisitorsIPAddr;

}

VB.Net Version::

-----------------------------------------------

Shared Sub GetUser_IP()

    If HttpContext.Current.Request.ServerVariables("HTTP_X_FORWARDED_FOR") IsNot Nothing Then

        VisitorsIPAddr = HttpContext.Current.Request.ServerVariables("HTTP_X_FORWARDED_FOR").ToString()

    ElseIf HttpContext.Current.Request.UserHostAddress.Length <> 0 Then

        VisitorsIPAddr = HttpContext.Current.Request.UserHostAddress

    End If

End Sub