21cn.cn.com.		30 IN SOA alec.ns.cloudflare.com. dns.cloudflare.com. (
				2397748667 ; serial
				10000      ; refresh (2 hours 46 minutes 40 seconds)
				2400       ; retry (40 minutes)
				604800     ; expire (1 week)
				1800       ; minimum (30 minutes)
				)

Name servers:
21cn.cn.com.		30 IN NS alec.ns.cloudflare.com.
21cn.cn.com.		30 IN NS daisy.ns.cloudflare.com.