I write this code in my web page but I got only output as "::1".

Please help me
Code:
string ip;

        ip =          Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
        if (!string.IsNullOrEmpty(ip))
        {
            string[] ipRange = ip.Split(',');
            int le = ipRange.Length - 1;
            string trueIP = ipRange[le];
        }
...