Servidores DNS Principal (mname) y Secundario (rname)
host: shownotes.com
class: IN
ttl: 900
type: SOA
mname: ns-510.awsdns-63.com
rname: awsdns-hostmaster.amazon.com
serial: 1
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 86400
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