Registro IPv4
host: scdn.com
class: IN
ttl: 3600
type: A
ip: 121.254.178.253

Servidores DNS Principal (mname) y Secundario (rname)
host: scdn.com
class: IN
ttl: 28959
type: SOA
mname: ns.domainca.com
rname: root.domainca.com
serial: 1508640307
refresh: 1800
retry: 600
expire: 1209600
minimum-ttl: 86400