code: def get_available_ip4(self, id_network):
          
  
          if not is_valid_int_param(id_network):
              raise InvalidParameterError(
                  u'Network identifier is invalid or was not informed.')
  
          url = 'ip/availableip4/' + str(id_network) + "/"
  
          code, xml = self.submit(None, 'GET', url)
  
          return self.response(code, xml)
docs: Get a available IP in the network ipv4
  
          :param id_network: Network identifier. Integer value and greater than zero.
  
          :return: Dictionary with the following structure:
  
          ::
  
              {'ip': {'ip': < available_ip >}}
  
          :raise IpNotAvailableError: Network dont have available IP for insert a new IP
          :raise NetworkIPv4NotFoundError: Network is not found
          :raise UserNotAuthorizedError: User dont have permission to get a available IP
          :raise InvalidParameterError: Network identifier is null or invalid.
          :raise XMLError: Networkapi failed to generate the XML response.
          :raise DataBaseError: Networkapi failed to access the database.