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: wwwmastercard.net
class: IN
ttl: 49270
type: A
ip: 165.160.15.20

Registro IPv4
host: wwwmastercard.net
class: IN
ttl: 49270
type: A
ip: 165.160.13.20

Servidores DNS Principal (mname) y Secundario (rname)
host: wwwmastercard.net
class: IN
ttl: 10921
type: SOA
mname: dns1.cscdns.net
rname: hostmaster.cscdns.net
serial: 2024060605
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 86400

Información TXT
host: wwwmastercard.net
class: IN
ttl: 10921
type: TXT
txt: v=spf1 -all
entries: Array