Servidores DNS Principal (mname) y Secundario (rname)
host: squares.net
class: IN
ttl: 3600
type: SOA
mname: dns.sakura.ad.jp
rname: noc.sakura.ad.jp
serial: 2024041600
refresh: 3600
retry: 900
expire: 3600000
minimum-ttl: 3600