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: rbcits.com
class: IN
ttl: 158
type: A
ip: 204.74.99.100

Servidores DNS Principal (mname) y Secundario (rname)
host: rbcits.com
class: IN
ttl: 900
type: SOA
mname: edns3.ultradns.com
rname: premiumdns.support.neustar
serial: 2019083242
refresh: 600
retry: 600
expire: 1209600
minimum-ttl: 900