Servidores DNS Principal (mname) y Secundario (rname)
host: sos-schluesseldienst-frankfurt.de
class: IN
ttl: 77023
type: SOA
mname: ns1.robhost.de
rname: hostmaster.sos-schluesseldienst-frankfurt.de
serial: 2024022600
refresh: 86400
retry: 7200
expire: 3600000
minimum-ttl: 900