Servidores DNS Principal (mname) y Secundario (rname)
host: linuxtest.net
class: IN
ttl: 3600
type: SOA
mname: ns1.sdsns.com
rname: nameserver.sds.co.kr
serial: 2010072610
refresh: 3600
retry: 300
expire: 604800
minimum-ttl: 3600

Información TXT
host: linuxtest.net
class: IN
ttl: 3599
type: TXT
txt: v=spf1 ip4:121.189.61.0/24 ~all
entries: Array