Servidores DNS Principal (mname) y Secundario (rname)
host: adca.com
class: IN
ttl: 3600
type: SOA
mname: dns3.alfa-safety.net
rname: dns.alfa-safety.fr
serial: 2023072002
refresh: 7200
retry: 1800
expire: 1209600
minimum-ttl: 3600