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

Non-authoritative answer:
Name:	push.duolingo.com
Address: 18.172.134.115
Name:	push.duolingo.com
Address: 18.172.134.35
Name:	push.duolingo.com
Address: 18.172.134.77
Name:	push.duolingo.com
Address: 18.172.134.112