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: 100.52.163.159
Name:	www.duolingo.com
Address: 3.233.123.72
Name:	www.duolingo.com
Address: 44.212.196.204
Name:	www.duolingo.com
Address: 98.83.91.162
Name:	www.duolingo.com
Address: 54.146.63.199
Name:	www.duolingo.com
Address: 34.235.99.208
Name:	www.duolingo.com
Address: 3.232.138.235
Name:	www.duolingo.com
Address: 98.86.33.138