Registro IPv4
host: previewurl.com
class: IN
ttl: 14400
type: A
ip: 74.200.236.202

Servidores DNS Principal (mname) y Secundario (rname)
host: previewurl.com
class: IN
ttl: 21600
type: SOA
mname: ns1.helmdns.com
rname: hostmaster.previewurl.com
serial: 2015071902
refresh: 3600
retry: 900
expire: 604800
minimum-ttl: 14400

Servidor de Correo
host: previewurl.com
class: IN
ttl: 14400
type: MX
pri: 21
target: mail.previewurl.com