Client IP Address in Custom MasterPage on Intranet

I have successfully created a custom master page and deployed that on my local machine via deploy from VS2010. It works correctly, changes the master page for all subsites as I wanted. It displays my local ip address correctly as shown on the first screenshot.
Then after much Googling, I managed to create a package from that solution and deploy it on the production server. It also, as expected, replaces all the master pages on the subsites as well. It does display an IP address, but it's the address of the server and not the IP address of the client accessing the server.
It was created with a Control Template and the code for the ip address in that file is:

       protected void Page_Load(object sender, EventArgs e)
        {
            string IP4Address = String.Empty;

            foreach (IPAddress IPA in Dns.GetHostAddresses(System.Web.HttpContext.Current.Request.UserHostAddress))
            {
                if (IPA.AddressFamily.ToString() == "InterNetwork")
                {
                    IP4Address = IPA.ToString();
                    break;
                }
            }

            if (IP4Address != String.Empty)
            {
                //return IP4Address;
            }

            foreach (IPAddress IPA in Dns.GetHostAddresses(Dns.GetHostName()))
            {
                if (IPA.AddressFamily.ToString() == "InterNetwork")
                {
                    IP4Address = IPA.ToString();
                    break;
                }
            }

            //return IP4Address;
            string ip = IP4Address;
            myip.Text = "My IP Address is: " + ip;
        }

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I need help getting the client's IP address to display on the client's machine whenever they load our intranet SharePoint. We use this for support purposes and is absolutely critical that I get this working correctly.