io-t.cn.		30 IN SOA dm1.longmingdns.com. dnsadmin.longmingdns.com. (
				1753380137 ; serial
				3600       ; refresh (1 hour)
				300        ; retry (5 minutes)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)

io-t.cn.		30 IN A	38.238.200.30

Name servers:
io-t.cn.		30 IN NS dm1.longmingdns.com.
io-t.cn.		30 IN NS dm2.longmingdns.com.