Registro IPv4
host: koder.cn
class: IN
ttl: 90
type: A
ip: 8.148.22.50

Servidores DNS Principal (mname) y Secundario (rname)
host: koder.cn
class: IN
ttl: 3600
type: SOA
mname: 
rname: hostmaster.nameserver
serial: 119
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 5