Servidores DNS Principal (mname) y Secundario (rname)
host: gracemull.com
class: IN
ttl: 14400
type: SOA
mname: ns1.siteground.net
rname: admins.siteground.com
serial: 10
refresh: 10800
retry: 3600
expire: 1209600
minimum-ttl: 3600