Registro IPv4
host: itcotools.com
class: IN
ttl: 90
type: A
ip: 127.0.0.1

Servidores DNS Principal (mname) y Secundario (rname)
host: itcotools.com
class: IN
ttl: 90
type: SOA
mname: 208.91.197.91
rname: hostmaster.itcotools.com
serial: 1794773650
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600