TryGet Valid IP Address

/// <summary>

              /// Tries to get a valid IP address

              /// </summary>

              /// <param name="address"></param>

              /// <returns>Returns false if an address is local or invalid</returns>

              public static bool TryGetValidPublicIpAddress(string ip, out IPAddress address)

              {

            //bail out if input was not supplied

                  if (string.IsNullOrEmpty(ip))

                  {

                      address = null;

                      return false;

                  }

            //ensure that string is a valid IP address

                  IPAddress validAddress;

                  if (!IPAddress.TryParse(ip, out validAddress))

                  {

                      address = null;

                      return false;

                  }

            //ensure that address is public, otherwise will throw an exception for local IP addresses

                  string localIpReges = Sitecore.Configuration.Settings.GetSetting(LocalIpRegex, DefaultLocalIpRegex);

                  if (Regex.IsMatch(ip, localIpReges))

                  {

                address = null;

                return false;

                  }

                  address = validAddress;

                  return true;

        }