root@ns1:/etc/bind/zones# cat cluebat.dk
$TTL    3600
@       IN      SOA     ns1.leandns.com.  root.localhost. (
        2           ;   serial
        6048000     ;   refresh
        86400       ;   retry
        2419200     ;   expire
        604800 )    ;   Negative cache ttl
;
@       IN  NS  ns1.leandns.com.
@       IN  NS  ns2.leandns.com.
@       IN  A   10.20.30.40