Servidores DNS Principal (mname) y Secundario (rname)
host: heuristics.be
class: IN
ttl: 3600
type: SOA
mname: ns1.openprovider.nl
rname: dns.openprovider.eu
serial: 2024041602
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600