Servidores DNS Principal (mname) y Secundario (rname)
host: topcoholdings.us
class: IN
ttl: 1800
type: SOA
mname: alberto.ns.cloudflare.com
rname: dns.cloudflare.com
serial: 2416967307
refresh: 10000
retry: 2400
expire: 604800
minimum-ttl: 1800
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