$ORIGIN .
$TTL 907200     ; 1 week 3 days 12 hours
16.168.192.in-addr.arpa IN SOA  server.schubert.home. admin.schubert.home. (
                                2019024233 ; serial
                                28800      ; refresh (8 hours)
                                604800     ; retry (1 week)
                                604800     ; expire (1 week)
                                86400      ; minimum (1 day)
                                )
                        NS      server.schubet.home.
$ORIGIN 16.168.192.in-addr.arpa.
1       PTR     gateway.schubert.home.
2       PTR     aps.schubert.home.
4       PTR     nas-1.schubert.home.
5       PTR     nas-2.schubert.home.
7       PTR     prn-keller.schubert.home.
9       PTR     server.schubert.home.