mtm.vn.			30 IN SOA ns-b3.tenten.vn. noreply.tenten.vn. (
				1633771050 ; serial
				3536       ; refresh (58 minutes 56 seconds)
				600        ; retry (10 minutes)
				86400      ; expire (1 day)
				3600       ; minimum (1 hour)
				)

Name servers:
mtm.vn.			30 IN NS ns-b3.tenten.vn.
mtm.vn.			30 IN NS ns-b2.tenten.vn.
mtm.vn.			30 IN NS ns-b1.tenten.vn.