itf.dut.edu.vn.		30 IN CNAME dut.edu.vn.
dut.edu.vn.		30 IN SOA ns-master.inet.vn. postmaster.inet.vn. (
				2015072800 ; serial
				10800      ; refresh (3 hours)
				3600       ; retry (1 hour)
				604800     ; expire (1 week)
				3600       ; minimum (1 hour)
				)
itf.dut.edu.vn.		30 IN CNAME dut.edu.vn.
itf.dut.edu.vn.		30 IN CNAME dut.edu.vn.

dut.edu.vn.		30 IN A	103.57.222.134
itf.dut.edu.vn.		30 IN CNAME dut.edu.vn.
itf.dut.edu.vn.		30 IN CNAME dut.edu.vn.

Name servers:
dut.edu.vn.		30 IN NS ns3.inet.vn.
dut.edu.vn.		30 IN NS ns2.inet.vn.
dut.edu.vn.		30 IN NS ns1.inet.vn.