Registro IPv4
host: shortnr.tk
class: IN
ttl: 300
type: A
ip: 46.191.157.7

Servidores DNS Principal (mname) y Secundario (rname)
host: shortnr.tk
class: IN
ttl: 300
type: SOA
mname: ns01.freenom.com
rname: soa.freenom.com
serial: 1746630324
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600