7b.cn.			30 IN SOA dns9.hichina.com. hostmaster.hichina.com. (
				2024082817 ; serial
				3600       ; refresh (1 hour)
				1200       ; retry (20 minutes)
				86400      ; expire (1 day)
				600        ; minimum (10 minutes)
				)
7b.cn.			30 IN CNAME overdue.aliyun.com.

overdue.aliyun.com.	30 IN A	170.33.13.246
7b.cn.			30 IN CNAME overdue.aliyun.com.

Name servers:
7b.cn.			30 IN NS dns10.hichina.com.
7b.cn.			30 IN NS dns9.hichina.com.