bbtree.cn.		30 IN SOA dns7.hichina.com. hostmaster.hichina.com. (
				2024120409 ; serial
				3600       ; refresh (1 hour)
				1200       ; retry (20 minutes)
				86400      ; expire (1 day)
				600        ; minimum (10 minutes)
				)

Mail exchangers:
bbtree.cn.		30 IN MX 5 mxbiz1.qq.com.
bbtree.cn.		30 IN MX 10 mxbiz2.qq.com.

Name servers:
bbtree.cn.		30 IN NS dns7.hichina.com.
bbtree.cn.		30 IN NS dns8.hichina.com.