Servidores DNS Principal (mname) y Secundario (rname)
host: mlcgi.com
class: IN
ttl: 86400
type: SOA
mname: ns1.hostmycgi.com
rname: ap-admins.hostmycgi.com
serial: 2019030501
refresh: 86400
retry: 10800
expire: 1209600
minimum-ttl: 3600