Test if the address is otherwise IETF reserved.

        Returns:
            A boolean, True if the address is within one of the
            reserved IPv6 Network ranges.

def is_reserved(self):
        """Test if the address is otherwise IETF reserved.

        Returns:
            A boolean, True if the address is within one of the
            reserved IPv6 Network ranges.

        """
        reserved_networks = [IPv6Network('::/8'), IPv6Network('100::/8'),
                             IPv6Network('200::/7'), IPv6Network('400::/6'),
                             IPv6Network('800::/5'), IPv6Network('1000::/4'),
                             IPv6Network('4000::/3'), IPv6Network('6000::/3'),
                             IPv6Network('8000::/3'), IPv6Network('A000::/3'),
                             IPv6Network('C000::/3'), IPv6Network('E000::/4'),
                             IPv6Network('F000::/5'), IPv6Network('F800::/6'),
                             IPv6Network('FE00::/9')]

        return any(self in x for x in reserved_networks)