DNS fail: can't resolve subdomains, server giving wrong response

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http://www.linuxquestions.org – I've got a DNS problem I cannot figure out. I've been digging and pinging all day and I've waited for caches to expire and I'm not having much luck. Any help would be much appreciated. From my desktop mac, I can't seem to resolve mail.port-o-call.net: Code: My-Mac:~ sneakyimp$ ping mail.port-o-call.net ping: cannot resolve mail.port-o-call.net: Unknown host whereas port-o-call.net resolves just fine: Code: My-Mac:~ sneakyimp$ ping port-o-call.net PING port-o-call.net ( 56 data bytes 64 bytes from icmp_seq=0 t (HowTos)