Registro IPv4
host: mcu123.net
class: IN
ttl: 600
type: A
ip: 156.251.43.34

Servidores DNS Principal (mname) y Secundario (rname)
host: mcu123.net
class: IN
ttl: 600
type: SOA
mname: ns1.alidns.com
rname: hostmaster.hichina.com
serial: 2026011209
refresh: 3600
retry: 1200
expire: 86400
minimum-ttl: 600