EXPIRE
The SOA field that tells a secondary how long it may continue serving a zone without successfully refreshing from an upstream source. After the interval, the zone becomes expired and should no longer be served authoritatively.
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2 definitions associated with SOA.
MNAME
The first domain-name field in the SOA record, conventionally naming the zone's primary source server. Modern distributed and hidden-primary architectures can make the literal operational role more nuanced.