Registro DMARC
v=DMARC1; p=reject; rua=mailto:mailauth-reports@google.com

Registro IPv4
host: googleadservices.com
class: IN
ttl: 300
type: A
ip: 172.217.21.2

Servidores DNS Principal (mname) y Secundario (rname)
host: googleadservices.com
class: IN
ttl: 90
type: SOA
mname: ns1.google.com
rname: dns-admin.google.com
serial: 698728253
refresh: 900
retry: 900
expire: 1800
minimum-ttl: 60

Servidor de Correo
host: googleadservices.com
class: IN
ttl: 300
type: MX
pri: 0
target: smtp.google.com

Información TXT
host: googleadservices.com
class: IN
ttl: 3600
type: TXT
txt: v=spf1 include:_spf.google.com ~all
entries: Array