Registro IPv4
host: excnn.com
class: IN
ttl: 3600
type: A
ip: 64.44.172.15

Servidores DNS Principal (mname) y Secundario (rname)
host: excnn.com
class: IN
ttl: 7200
type: SOA
mname: ns-uk.topdns.com
rname: hostmaster.topdns.com
serial: 2025051807
refresh: 43200
retry: 900
expire: 1209600
minimum-ttl: 3600