Registro IPv4
host: us-knife.com
class: IN
ttl: 90
type: A
ip: 67.21.89.52

Servidores DNS Principal (mname) y Secundario (rname)
host: us-knife.com
class: IN
ttl: 259200
type: SOA
mname: www.us-knife.com
rname: us-knife.com
serial: 2008080300
refresh: 1800
retry: 3600
expire: 604800
minimum-ttl: 3600