Servidores DNS Principal (mname) y Secundario (rname)
host: cognitiveload.net
class: IN
ttl: 3600
type: SOA
mname: ns1.netregistry.net
rname: postmaster.netregistry.net
serial: 2025030101
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600