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: 44.207.76.51
Name:	www.duolingo.com
Address: 100.28.176.250
Name:	www.duolingo.com
Address: 3.90.72.239
Name:	www.duolingo.com
Address: 44.218.57.106
Name:	www.duolingo.com
Address: 3.219.156.205
Name:	www.duolingo.com
Address: 54.165.63.208
Name:	www.duolingo.com
Address: 54.243.211.85
Name:	www.duolingo.com
Address: 34.239.219.136