Registro IPv4
host: biz.com
class: IN
ttl: 300
type: A
ip: 64.99.64.37

Servidores DNS Principal (mname) y Secundario (rname)
host: biz.com
class: IN
ttl: 300
type: SOA
mname: ns1.systemdns.com
rname: hostmaster.systemdns.com
serial: 1783553251
refresh: 10800
retry: 3600
expire: 1209600
minimum-ttl: 60