Registro DMARC
v=spf1 -all

Registro IPv4
host: cron.jp
class: IN
ttl: 300
type: A
ip: 72.52.178.23

Servidores DNS Principal (mname) y Secundario (rname)
host: cron.jp
class: IN
ttl: 21600
type: SOA
mname: 01.dnsv.jp
rname: hostmaster.dnsv.jp
serial: 1770791874
refresh: 3600
retry: 900
expire: 604800
minimum-ttl: 300