gchar* flx_reverse_lookup_name_ipv4(const flxIPv4Address *a);
gchar* flx_reverse_lookup_name_ipv6_arpa(const flxIPv6Address *a);
gchar* flx_reverse_lookup_name_ipv4(const flxIPv4Address *a);
gchar* flx_reverse_lookup_name_ipv6_arpa(const flxIPv6Address *a);