Registro IPv4
host: 521yy.com
class: IN
ttl: 90
type: A
ip: 208.98.40.74

Servidores DNS Principal (mname) y Secundario (rname)
host: 521yy.com
class: IN
ttl: 90
type: SOA
mname: www.521yy.com
rname: 521yy.com
serial: 2008080300
refresh: 1800
retry: 3600
expire: 604800
minimum-ttl: 3600