$ORIGIN .
in-addr.arpa                    300     IN      SOA     root.dn11 hostmaster.dn11 2025012601 60 60 604800 60
in-addr.arpa                    300     IN      NS      172.16.255.53
18.10.in-addr.arpa              60      IN      NS      ns1.potat0.dn11
4.16.172.in-addr.arpa           60      IN      NS      ns2.baimeow.dn11
14.16.172.in-addr.arpa          60      IN      NS      ns2.baimeow.dn11