Servidores DNS Principal (mname) y Secundario (rname)
host: azure-dns.com
class: IN
ttl: 1982
type: SOA
mname: ns1-01.azure-dns.com
rname: azuredns-hostmaster.microsoft.com
serial: 6
refresh: 7200
retry: 900
expire: 2419200
minimum-ttl: 3600