I have primary zone and one deligated zone(xxx.ru and hq.xxx.ru).For primary db file is: @ IN SOA xxx.ru .... () IN NS ns.xxx.ru. IN MX ... hq IN NS ns.hq.xxx.ru. ; deligated zone IN MX ... ns.hq IN A ..... ; glue record and how can I deligate in-addr.arpa zone in order someone outside can translate IP to name in 'hq' zone.