Servidores DNS Principal (mname) y Secundario (rname)
host: thenationalalzheimercenter.com
class: IN
ttl: 900
type: SOA
mname: ns1.hover.com
rname: dnsmaster.hover.com
serial: 1720468510
refresh: 1800
retry: 900
expire: 604800
minimum-ttl: 300