Registro DMARC
v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com

Registro IPv4
host: harpercollinsfocus.com
class: IN
ttl: 300
type: A
ip: 104.16.49.28

Registro IPv4
host: harpercollinsfocus.com
class: IN
ttl: 300
type: A
ip: 104.16.48.28

Servidores DNS Principal (mname) y Secundario (rname)
host: harpercollinsfocus.com
class: IN
ttl: 1800
type: SOA
mname: amy.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2356239621
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800

Información TXT
host: harpercollinsfocus.com
class: IN
ttl: 300
type: TXT
txt: ca3-9578f62dc74d4cae9ce58127762e3d5b
entries: Array

Información TXT
host: harpercollinsfocus.com
class: IN
ttl: 300
type: TXT
txt: facebook-domain-verification=qv586co8axgaf1bswm59odbpzp653y
entries: Array

Registro IPv6
host: harpercollinsfocus.com
class: IN
ttl: 300
type: AAAA
ipv6: 2606:4700::6810:301c

Registro IPv6
host: harpercollinsfocus.com
class: IN
ttl: 300
type: AAAA
ipv6: 2606:4700::6810:311c