$TTL 2d
@       IN     SOA     a.and. hostmaster.a.and. (
                           2           ; Serial
                      604800           ; Refresh
                       86400           ; Retry
                     2419200           ; Expire
                      604800  )        ; Negative Cache TTL  
                      
and.           NS     a.and.
a.and.         A      10.30.20.2

$ORIGIN piros.and.
@              NS     ns.zold.and.
ns.zold.and.   A      10.30.20.3

$ORIGIN zold.and.
@              NS     ns
ns             A      10.30.20.3