C# - Get Visitor/Client ip address : ASP.NET

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If you want to get the ip address of users from asp.net web application when user access the web page, you can use this method to return the Client / visitor ip address.

Method GetVisitorIPAddress - .Net 4 and above

        /// <summary>
        /// method to get Client ip address
        /// </summary>
        /// <param name="GetLan"> set to true if want to get local(LAN) Connected ip address</param>
        /// <returns></returns>
        public static string GetVisitorIPAddress(bool GetLan = false)
        {
            string visitorIPAddress = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

            if (String.IsNullOrEmpty(visitorIPAddress))
                visitorIPAddress = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];

            if (string.IsNullOrEmpty(visitorIPAddress))
                visitorIPAddress = HttpContext.Current.Request.UserHostAddress;

            if (string.IsNullOrEmpty(visitorIPAddress) || visitorIPAddress.Trim() == "::1")
            {
                GetLan = true;
                visitorIPAddress = string.Empty;
            }

            if (GetLan)
            {
                if (string.IsNullOrEmpty(visitorIPAddress))
                {
                    //This is for Local(LAN) Connected ID Address
                    string stringHostName = Dns.GetHostName();
                    //Get Ip Host Entry
                    IPHostEntry ipHostEntries = Dns.GetHostEntry(stringHostName);
                    //Get Ip Address From The Ip Host Entry Address List
                    IPAddress[] arrIpAddress = ipHostEntries.AddressList;

                    try
                    {
                        visitorIPAddress = arrIpAddress[arrIpAddress.Length - 2].ToString();
                    }
                    catch
                    {
                        try
                        {
                            visitorIPAddress = arrIpAddress[0].ToString();
                        }
                        catch
                        {
                            try
                            {
                                arrIpAddress = Dns.GetHostAddresses(stringHostName);
                                visitorIPAddress = arrIpAddress[0].ToString();
                            }
                            catch
                            {
                                visitorIPAddress = "127.0.0.1";
                            }
                        }
                    }
                }
            }
            return visitorIPAddress;
        }


Method GetVisitorIPAddress - .Net 3.5 and below

         /// <summary>
        /// method to get Client ip address
        /// </summary>
        /// <param name="GetLan"> set to true if want to get local(LAN) Connected ip address</param>
        /// <returns></returns>
        public static string GetVisitorIPAddress(bool GetLan)
        {
            string visitorIPAddress = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

            if (String.IsNullOrEmpty(visitorIPAddress))
                visitorIPAddress = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];

            if (string.IsNullOrEmpty(visitorIPAddress))
                visitorIPAddress = HttpContext.Current.Request.UserHostAddress;

            if (string.IsNullOrEmpty(visitorIPAddress) || visitorIPAddress.Trim() == "::1")
            {
                GetLan = true;
                visitorIPAddress = string.Empty;
            }

            if (GetLan)
            {
                if (string.IsNullOrEmpty(visitorIPAddress))
                {
                    //This is for Local(LAN) Connected ID Address
                    string stringHostName = Dns.GetHostName();
                    //Get Ip Host Entry
                    IPHostEntry ipHostEntries = Dns.GetHostEntry(stringHostName);
                    //Get Ip Address From The Ip Host Entry Address List
                    IPAddress[] arrIpAddress = ipHostEntries.AddressList;

                    try
                    {
                        visitorIPAddress = arrIpAddress[arrIpAddress.Length - 2].ToString();
                    }
                    catch
                    {
                        try
                        {
                            visitorIPAddress = arrIpAddress[0].ToString();
                        }
                        catch
                        {
                            try
                            {
                                arrIpAddress = Dns.GetHostAddresses(stringHostName);
                                visitorIPAddress = arrIpAddress[0].ToString();
                            }
                            catch
                            {
                                visitorIPAddress = "127.0.0.1";
                            }
                        }
                    }
                }
            }
            return visitorIPAddress;
        }


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