Servidores DNS Principal (mname) y Secundario (rname)
host: mundong.co.kr
class: IN
ttl: 3600
type: SOA
mname: ns1.uhost.co.kr
rname: root.ns1.uhost.co.kr
serial: 2004111001
refresh: 28800
retry: 14400
expire: 3600000
minimum-ttl: 86400