shell:$ nslookup -timeout=2 -retry=1 'whatsapp.herokuapp.com'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
whatsapp.herokuapp.com	canonical name = va06.ingress.herokuapp.com.
Name:	va06.ingress.herokuapp.com
Address: 13.248.132.84
Name:	va06.ingress.herokuapp.com
Address: 76.223.120.82
Name:	va06.ingress.herokuapp.com
Address: 166.117.102.95
Name:	va06.ingress.herokuapp.com
Address: 3.33.240.98