Servidores DNS Principal (mname) y Secundario (rname)
host: cbo.nl
class: IN
ttl: 1800
type: SOA
mname: ns1.flexwebhosting.nl
rname: hostmaster.cbo.nl
serial: 2100000445
refresh: 14400
retry: 3600
expire: 604800
minimum-ttl: 86400

Información TXT
host: cbo.nl
class: IN
ttl: 21600
type: TXT
txt: v=spf1 a mx a:spf.flexfilter.nl ~all
entries: Array