Servidores DNS Principal (mname) y Secundario (rname)
host: 512005.com
class: IN
ttl: 180
type: SOA
mname: cygnet.dnspod.net
rname: freednsadmin.dnspod.com
serial: 1745822078
refresh: 3600
retry: 180
expire: 1209600
minimum-ttl: 180