'Test if the address is unspecified.
Returns:
A boolean, True if this is the unspecified address as defined in
RFC 2373 2.5.2.'

@property
def is_unspecified(self):

    if isinstance(self, (IPv6Network, IPv6Interface)):
        return ((int(self.network_address) == 0) and (getattr(self, '_prefixlen', 128) == 128))
    return (self._ip == 0)
