$ORIGIN test.co.jp.
$TTL 604800
@ IN SOA ns1.test.jp. root.test.co.jp. (
  0000000000    ; serial
          1D    ; refresh
          1H    ; retry
          1W    ; expire
     2000000 )  ; minimum

                    IN NS   ns1.test.jp.
                    IN NS   ns2.test.jp.
ns1.test.jp.        IN A    172.18.1.16
ns2.test.jp.        IN A    172.18.1.17

www                 IN A    1.2.3.4

$INCLUDE /var/named/keys/test.co.jp.keys