Servidores DNS Principal (mname) y Secundario (rname)
host: th0909.com
class: IN
ttl: 3600
type: SOA
mname: ns1.domainnamedns.com
rname: support.namens.net
serial: 1740397744
refresh: 3600
retry: 1800
expire: 1209600
minimum-ttl: 180