Registro IPv4
host: book21.com
class: IN
ttl: 3714
type: A
ip: 175.117.145.205

Servidores DNS Principal (mname) y Secundario (rname)
host: book21.com
class: IN
ttl: 3713
type: SOA
mname: ns1.hhosting.co.kr
rname: domain.hhosting.co.kr
serial: 2015062200
refresh: 21600
retry: 3600
expire: 1209600
minimum-ttl: 21600

Servidor de Correo
host: book21.com
class: IN
ttl: 3713
type: MX
pri: 10
target: mail.book21.co.kr

Servidor de Correo
host: book21.com
class: IN
ttl: 3713
type: MX
pri: 20
target: mail2.book21.co.kr

Información TXT
host: book21.com
class: IN
ttl: 3714
type: TXT
txt: v=spf1 ip4:175.117.145.205 -all
entries: Array