Servidores DNS Principal (mname) y Secundario (rname)
host: mcast.net
class: IN
ttl: 1800
type: SOA
mname: sns.dns.icann.org
rname: noc.dns.icann.org
serial: 2023093964
refresh: 7200
retry: 3600
expire: 604800
minimum-ttl: 3600

Servidor de Correo
host: mcast.net
class: IN
ttl: 21600
type: MX
pri: 10
target: pechora.icann.org