shell:$ nslookup -timeout=2 -retry=1 'viettel.com.vn'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	viettel.com.vn
Address: 171.244.232.16
Name:	viettel.com.vn
Address: 171.244.232.17
Name:	viettel.com.vn
Address: 2402:800:20ff:4013::2222
Name:	viettel.com.vn
Address: 2402:800:20ff:4013::1111