Servidores DNS Principal (mname) y Secundario (rname)
host: researchscientificservices.com
class: IN
ttl: 4494
type: SOA
mname: NS1.WORLDNIC.com
rname: namehost.WORLDNIC.com
serial: 124033119
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600