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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.
Re:Understanding DNS Record Types by ulysses on Thursday December 11, 2014 @01:31PM (#8736310)
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."

https://www.ietf.org/rfc/rfc1035.txt