iSpyApplication.MainForm.IsValidIP C# (CSharp) Method

        private static bool IsValidIP(IPAddress ip)
        {
            if (ip.AddressFamily == AddressFamily.InterNetwork)
            {
                if (!System.Net.IPAddress.IsLoopback(ip))
                {
                    var sip = ip.ToString().Split('.');
                    switch (sip[0])
                    {
                        default:
                            return true;
                        case "0":
                        case "127":
                        case "169":

                            break;
                    }
                }
            }
            return false;
        }