0437.cn.		30 IN SOA ns11.xincache.com. ns12.xincache.com. (
				1576564361 ; serial
				3600       ; refresh (1 hour)
				180        ; retry (3 minutes)
				1209600    ; expire (2 weeks)
				180        ; minimum (3 minutes)
				)

Name servers:
0437.cn.		30 IN NS ns19.xincache.com.
0437.cn.		30 IN NS ns20.xincache.com.