firebird.jp.		30 IN SOA ns1.firebird.jp. root.sv0.firebird.jp. (
				0          ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				3600       ; minimum (1 hour)
				)

firebird.jp.		30 IN A	162.43.112.249

Name servers:
firebird.jp.		30 IN NS ns2.firebird.jp.
firebird.jp.		30 IN NS ns3.firebird.jp.
firebird.jp.		30 IN NS ns1.firebird.jp.