Registro IPv4
host: certcenter.com
class: IN
ttl: 3600
type: A
ip: 216.168.244.42

Servidores DNS Principal (mname) y Secundario (rname)
host: certcenter.com
class: IN
ttl: 86400
type: SOA
mname: ns20.digicertdns.com
rname: dns.digicertdns.com
serial: 2009010109
refresh: 43200
retry: 3600
expire: 1209600
minimum-ttl: 180