Servidores DNS Principal (mname) y Secundario (rname)
host: classes.com.hk
class: IN
ttl: 21600
type: SOA
mname: ns-cloud-c1.googledomains.com
rname: cloud-dns-hostmaster.google.com
serial: 1
refresh: 21600
retry: 3600
expire: 259200
minimum-ttl: 300

Servidor de Correo
host: classes.com.hk
class: IN
ttl: 3600
type: MX
pri: 0
target: classes-com-hk.mail.protection.outlook.com

Información TXT
host: classes.com.hk
class: IN
ttl: 3600
type: TXT
txt: v=spf1 include:spf.protection.outlook.com -all
entries: Array