Servidores DNS Principal (mname) y Secundario (rname)
host: xuanhuasc.com
class: IN
ttl: 180
type: SOA
mname: a.dnspod.com
rname: domainadmin.dnspod.com
serial: 1781085551
refresh: 3600
retry: 180
expire: 1209600
minimum-ttl: 180