sn1907.cn.		30 IN SOA dm1.longmingdns.com. dnsadmin.longmingdns.com. (
				1767084123 ; serial
				3600       ; refresh (1 hour)
				300        ; retry (5 minutes)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)

sn1907.cn.		30 IN A	172.80.33.73

Name servers:
sn1907.cn.		30 IN NS dm1.longmingdns.com.
sn1907.cn.		30 IN NS dm2.longmingdns.com.