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

Registro IPv4
host: is-by.us
class: IN
ttl: 300
type: A
ip: 132.226.44.1

Servidores DNS Principal (mname) y Secundario (rname)
host: is-by.us
class: IN
ttl: 14247
type: SOA
mname: ns1.dyndns.org
rname: hostmaster.dyndns.org
serial: 2018142451
refresh: 10800
retry: 1800
expire: 604800
minimum-ttl: 1800