Servidores DNS Principal (mname) y Secundario (rname)
host: imotare.com
class: IN
ttl: 3600
type: SOA
mname: master.dns.ne.jp
rname: tech.sakura.ad.jp
serial: 2018050321
refresh: 3600
retry: 900
expire: 3600000
minimum-ttl: 3600