sn1907.cn.		30 IN SOA dm1.dns.com. dnsadmin.dns.com. (
				1702283204 ; serial
				7200       ; refresh (2 hours)
				3600       ; retry (1 hour)
				1209600    ; expire (2 weeks)
				1800       ; minimum (30 minutes)
				)

sn1907.cn.		30 IN A	142.252.100.76

Name servers:
sn1907.cn.		30 IN NS dm1.dns.com.
sn1907.cn.		30 IN NS dm2.dns.com.