Servidores DNS Principal (mname) y Secundario (rname)
host: b1-1-529.com
class: IN
ttl: 7200
type: SOA
mname: ns-uk.topdns.com
rname: hostmaster.topdns.com
serial: 2025031003
refresh: 43200
retry: 900
expire: 1209600
minimum-ttl: 3600