Servidores DNS Principal (mname) y Secundario (rname)
host: pool90-71-64.dynamic.orange.es
class: IN
ttl: 21600
type: SOA
mname: ns1.orange.es
rname: dnsmaster.es.orange-ftgroup.com
serial: 2021092050
refresh: 86400
retry: 7200
expire: 2592000
minimum-ttl: 172800