021sg.cn.		30 IN SOA ns1.22.cn. dnsadmin.22.cn. (
				1694052026 ; serial
				7200       ; refresh (2 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)

021sg.cn.		30 IN A	47.240.164.21

Name servers:
021sg.cn.		30 IN NS ns1.22.cn.
021sg.cn.		30 IN NS ns2.22.cn.