ig9.vn.			30 IN SOA ns1.zonedns.vn. root.ig9.vn. (
				2020092707 ; serial
				1200       ; refresh (20 minutes)
				600        ; retry (10 minutes)
				1209600    ; expire (2 weeks)
				3600       ; minimum (1 hour)
				)

ig9.vn.			30 IN A	210.211.120.158

Name servers:
ig9.vn.			30 IN NS ns1.zonedns.vn.
ig9.vn.			30 IN NS ns3.zonedns.vn.
ig9.vn.			30 IN NS ns2.zonedns.vn.