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

Non-authoritative answer:
www.mobifone.vn	canonical name = vjxbqk5.ng.impervadns.net.
Name:	vjxbqk5.ng.impervadns.net
Address: 45.60.45.231