Invalid IP address check

public static bool IsValidIpAddress(IPAddress address)

        {

            string ip = address != null ? address.ToString() : string.Empty;

               

            if (string.IsNullOrEmpty(ip) ||

                ip == "0.0.0.0" ||

                ip == "127.0.0.1" ||

                Regex.IsMatch(ip, @"^10\.") ||

                Regex.IsMatch(ip, @"^192\.168\."))

            {

                return false;

            }

            var matches = Regex.Matches(ip, @"^172\.(\d+)");

            if (matches.Count == 1)

            {

                int range;

                if (matches[0].Success &&

                    matches[0].Groups.Count == 2 &&

                    Int32.TryParse(matches[0].Groups[1].Value, out range))

                {

                    if (range >= 16 && range <= 31)

                    {

                        return false;

                    }

                }

            }

            return true;

        }