shell:$ nslookup -timeout=2 -retry=1 'www.duolingo.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	www.duolingo.com
Address: 44.216.81.222
Name:	www.duolingo.com
Address: 3.222.64.239
Name:	www.duolingo.com
Address: 52.71.245.118
Name:	www.duolingo.com
Address: 44.194.15.6
Name:	www.duolingo.com
Address: 44.197.149.231
Name:	www.duolingo.com
Address: 54.243.122.127
Name:	www.duolingo.com
Address: 3.222.123.241
Name:	www.duolingo.com
Address: 34.232.141.230