Registro IPv4
host: www6.cn
class: IN
ttl: 3600
type: A
ip: 121.12.170.22

Servidores DNS Principal (mname) y Secundario (rname)
host: www6.cn
class: IN
ttl: 3600
type: SOA
mname: 
rname: hostmaster.nameserver
serial: 887
refresh: 28800
retry: 7200
expire: 604800
minimum-ttl: 5