y/var/named/towa.oiden.zone.revz 

;$ORIGIN 76.168.192.in-addr.arpa.
@                       IN      SOA     dns.oiden.net. root.oiden.net. (
                        2001013101      ; Serial
                        10800           ; Refresh after 1 hour
                        3600            ; Retry after 5 minutes
                        604800          ; Expire after 1 week
                        86400 )         ; Minimum TTL of 4 hour

                        IN      NS      dns.oiden.net.
                        IN      PTR     towa.oiden.net.
                        IN      A       255.255.255.0

1                       IN      PTR     rta52i.towa.oiden.net.
2                       IN      PTR     j33.towa.oiden.net.
3                       IN      PTR     t71.towa.oiden.net.
4                       IN      PTR     vws320.towa.oiden.net.
5                       IN      PTR     dmz5.towa.oiden.net.