Registro IPv4
host: htb.us
class: IN
ttl: 300
type: A
ip: 157.254.188.251

Servidores DNS Principal (mname) y Secundario (rname)
host: htb.us
class: IN
ttl: 7200
type: SOA
mname: ns-canada.topdns.com
rname: hostmaster.topdns.com
serial: 2026101905
refresh: 43200
retry: 900
expire: 1209600
minimum-ttl: 3600