Registro IPv4
host: agents.md
class: IN
ttl: 3600
type: A
ip: 64.239.109.1

Servidores DNS Principal (mname) y Secundario (rname)
host: agents.md
class: IN
ttl: 3600
type: SOA
mname: ns1-06.azure-dns.com
rname: azuredns-hostmaster.microsoft.com
serial: 1
refresh: 3600
retry: 300
expire: 2419200
minimum-ttl: 300