Registro IPv4
host: topcardiacsurgeons.com
class: IN
ttl: 3978
type: A
ip: 208.91.197.39

Servidores DNS Principal (mname) y Secundario (rname)
host: topcardiacsurgeons.com
class: IN
ttl: 7200
type: SOA
mname: DNS101.REGISTER.com
rname: root.REGISTER.com
serial: 120042815
refresh: 10800
retry: 3600
expire: 604800
minimum-ttl: 3600