Servidores DNS Principal (mname) y Secundario (rname)
host: demarco.com.sg
class: IN
ttl: 360
type: SOA
mname: ns10.zonecybersite.com
rname: support.cybersite.com.sg
serial: 2021061800
refresh: 10800
retry: 3600
expire: 777600
minimum-ttl: 360