Servidores DNS Principal (mname) y Secundario (rname)
host: packagingholdings.com
class: IN
ttl: 11191
type: SOA
mname: cbru.br.ns.els-gms.att.net
rname: rm-hostmaster.ems.att.com
serial: 1
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 86400