$ORIGIN .
$TTL 3600       ; 1 hour
bobo.example.net         IN SOA  ns1.example.net. admin.ns1.example.net. (
                                201        ; serial
                                600        ; refresh (10 minutes)
                                3600       ; retry (1 hour)
                                604800     ; expire (1 week)
                                3600       ; minimum (1 hour)
                                )

        IN              NS      ns1.example.net.
        IN              NS      ns2.example.net.
        IN              A       31.32.33.81

$ORIGIN bobo.example.net.

ns1                     A       41.42.43.81
ns2                     A       51.52.53.81
*                       CNAME   bobo.example.net.