Servidores DNS Principal (mname) y Secundario (rname)
host: hanoi.vn
class: IN
ttl: 1800
type: SOA
mname: dns-master.vnnic.vn
rname: postmaster.vnnic.vn
serial: 2017019898
refresh: 3600
retry: 1800
expire: 604800
minimum-ttl: 5400
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