Servidores DNS Principal (mname) y Secundario (rname)
host: Facebook.net
class: IN
ttl: 3600
type: SOA
mname: a.ns.facebook.com
rname: dns.facebook.com
serial: 4207849484
refresh: 14400
retry: 1800
expire: 604800
minimum-ttl: 300

Información TXT
host: Facebook.net
class: IN
ttl: 1800
type: TXT
txt: v=spf1 ip4:69.63.179.25 ip4:69.63.178.128/25 ip4:69.63.184.0/25 ip4:66.220.144.128/25 ip4:66.220.155.0/24 mx -all
entries: Array