Servidores DNS Principal (mname) y Secundario (rname)
host: textbooksu.com
class: IN
ttl: 3600
type: SOA
mname: ns23.domaincontrol.com
rname: dns.jomax.net
serial: 2025042406
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 600
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