shell:$ nslookup -timeout=2 -retry=1 'imagemytel.viettel.net'
;; communications error to 1.1.1.1#53: timed out
Server:		8.8.8.8
Address:	8.8.8.8#53

Non-authoritative answer:
Name:	imagemytel.viettel.net
Address: 199.191.50.184