Servidores DNS Principal (mname) y Secundario (rname)
host: grc.nasa.gov
class: IN
ttl: 300
type: SOA
mname: a1-32.akam.net
rname: dns.nasa.gov
serial: 2009112911
refresh: 7200
retry: 900
expire: 1209600
minimum-ttl: 300

Servidor de Correo
host: grc.nasa.gov
class: IN
ttl: 300
type: MX
pri: 0
target: nasa-gov.mail.protection.outlook.com

Información TXT
host: grc.nasa.gov
class: IN
ttl: 300
type: TXT
txt: v=spf1 mx ~all
entries: Array