Servidores DNS Principal (mname) y Secundario (rname)
host: qianhuaweb.com
class: IN
ttl: 180
type: SOA
mname: ns11.xincache.com
rname: ns12.xincache.com
serial: 1777518058
refresh: 3600
retry: 180
expire: 1209600
minimum-ttl: 180