$TTL    604800
@       IN      SOA     test.lan. root.test.lan. (
                              2         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL

@       IN      NS      ns.

5       IN      PTR     test1.test.lan.
6       IN      PTR     test2.test.lan.