Registro IPv4
host: duba.cn
class: IN
ttl: 600
type: A
ip: 106.53.103.252

Servidores DNS Principal (mname) y Secundario (rname)
host: duba.cn
class: IN
ttl: 7200
type: SOA
mname: v1s1.xundns.com
rname: nsadmin.xundns.com
serial: 5446313
refresh: 3600
retry: 600
expire: 86400
minimum-ttl: 600