r30.cn.			30 IN SOA ns17.xincache.com. enterprise1dnsadmin.dnspod.com. (
				1623317353 ; serial
				3600       ; refresh (1 hour)
				180        ; retry (3 minutes)
				1209600    ; expire (2 weeks)
				180        ; minimum (3 minutes)
				)

r30.cn.			30 IN A	121.37.252.99

Name servers:
r30.cn.			30 IN NS ns18.xincache.com.
r30.cn.			30 IN NS ns17.xincache.com.