Servidores DNS Principal (mname) y Secundario (rname)
host: americanspeedways.net
class: IN
ttl: 3600
type: SOA
mname: dns01.muumuu-domain.com
rname: postmaster.americanspeedways.net
serial: 1770063122
refresh: 3600
retry: 1800
expire: 604800
minimum-ttl: 3600