Servidores DNS Principal (mname) y Secundario (rname)
host: antwerpexpat.com
class: IN
ttl: 86400
type: SOA
mname: ns.zxcs.nl
rname: hostmaster.antwerpexpat.com
serial: 2021010100
refresh: 600
retry: 3600
expire: 1209600
minimum-ttl: 86400