shell:$ nslookup -timeout=2 -retry=1 'www.duolingo.com'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
Name:	www.duolingo.com
Address: 108.138.106.50
Name:	www.duolingo.com
Address: 108.138.106.98
Name:	www.duolingo.com
Address: 108.138.106.7
Name:	www.duolingo.com
Address: 108.138.106.116