Registro IPv4
host: dropbox.mx
class: IN
ttl: 13899
type: A
ip: 149.56.83.252

Servidores DNS Principal (mname) y Secundario (rname)
host: dropbox.mx
class: IN
ttl: 13899
type: SOA
mname: ns.dropbox.mx
rname: carlos.trec.com.mx
serial: 1470014562
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 10800

Servidor de Correo
host: dropbox.mx
class: IN
ttl: 13900
type: MX
pri: 10
target: mail.dropbox.mx