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Checking for reverse doesn’t work, eg.:
#check_dns_host.pl -H 8.8.8.8.in-addr.arpa -Q REVERSE -W 1000 -C 1000
DNS OK! QUERYRETURNCODE=(NOERROR => 8.8.8.8.in-addr.arpa) ANSWERS=(0) QUERY_RETURNVAL=() ELAPSED=(8 ms) | DurationMS=8
Reverse checks always return ANSWERS=(0).
Forward seems to work fine.