/var/named/192.168.0.db

$TTL 3600
@ IN SOA ns1.gw.e-ryoichi.net. root.ns1.gw.e-ryoichi.net. (
2001072201 ; Serial
1800 ; Refresh
300 ; Retry
36000 ; Expire
3600 ) ; Minimum

IN NS ns1.gw.e-ryoichi.net.
IN NS ns2.gw.e-ryoichi.net.

IN PTR gw.e-ryoichi.net.
IN A 255.255.255.0

1 IN PTR mbg.gw.e-ryoichi.net.

11 IN PTR ms1.gw.e-ryoichi.net.
12 IN PTR ms2.gw.e-ryoichi.net.

13 IN PTR ms3.gw.e-ryoichi.net.
14 IN PTR ms4.gw.e-ryoichi.net.