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: 3.90.72.239
Name:	www.duolingo.com
Address: 50.19.20.129
Name:	www.duolingo.com
Address: 50.17.83.134
Name:	www.duolingo.com
Address: 34.200.164.243
Name:	www.duolingo.com
Address: 3.225.166.82
Name:	www.duolingo.com
Address: 44.213.222.89
Name:	www.duolingo.com
Address: 35.174.69.73
Name:	www.duolingo.com
Address: 3.222.64.239