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

sixcore.jp.		30 IN A	202.226.36.231

Name servers:
sixcore.jp.		30 IN NS ns1.sixcore.ne.jp.
sixcore.jp.		30 IN NS ns2.sixcore.ne.jp.