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

Non-authoritative answer:
Name:	whatsapp.harborcb.com
Address: 104.18.3.198
Name:	whatsapp.harborcb.com
Address: 104.18.2.198
Name:	whatsapp.harborcb.com
Address: 2606:4700::6812:2c6
Name:	whatsapp.harborcb.com
Address: 2606:4700::6812:3c6