Re:Understanding DNS Record Types
by grhmc on Thursday December 11, 2014 @01:12PM
(#8736195)
Seems implementation specific. BIND does this you're right, but many services don't follow the rule as closely.
[ Parent
| on HN ]
Actually, from RFC 1035, section 5.1:
"If an entry for an RR begins with a blank, then the RR is assumed to be owned by the last stated owner."