Registro DMARC
v=DMARC1; p=reject; rua=mailto:a@dmarcreports.facebook.com;

Registro IPv4
host: facebock.com
class: IN
ttl: 60
type: A
ip: 157.240.243.14

Servidores DNS Principal (mname) y Secundario (rname)
host: facebock.com
class: IN
ttl: 3600
type: SOA
mname: a.ns.facebook.com
rname: dns.facebook.com
serial: 4207849484
refresh: 14400
retry: 1800
expire: 604800
minimum-ttl: 3600

Información TXT
host: facebock.com
class: IN
ttl: 7200
type: TXT
txt: v=spf1 -all
entries: Array