Servidores DNS Principal (mname) y Secundario (rname)
host: artisan-project.eu
class: IN
ttl: 21600
type: SOA
mname: risc990.bologna.enea.it
rname: mercuri.bologna.enea.it
serial: 2011121501
refresh: 3600
retry: 900
expire: 1209600
minimum-ttl: 86400