$TTL 86400 @ IN SOA ns.****.co.jp. postmaster.****.co.jp. ( 2001012601 ; Serial 10800 ; Refresh 3 days 3600 ; Retry after 1 hours 604800 ; Expire afteer 1 week 86400 ; Minimum TTL of 1 day ) ; IN NS ns.****.co.jp. IN NS ns2.****.co.jp. ; 1 IN PTR localhost. ;