Servidores DNS Principal (mname) y Secundario (rname)
host: anticlinicalkey.com
class: IN
ttl: 3600
type: SOA
mname: ns1.reedelsevier.com
rname: hostmaster.lexisnexis.com
serial: 22
refresh: 3600
retry: 900
expire: 2419200
minimum-ttl: 900