shell:$ nslookup -timeout=2 -retry=1 'autodiscover.whatsapp.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
autodiscover.whatsapp.com	canonical name = autodiscover.fb.com.
autodiscover.fb.com	canonical name = autodiscover.outlook.com.
autodiscover.outlook.com	canonical name = atod-g2.tm-4.office.com.
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.40
Name:	atod-g2.tm-4.office.com
Address: 52.96.170.88
Name:	atod-g2.tm-4.office.com
Address: 52.96.163.40
Name:	atod-g2.tm-4.office.com
Address: 52.96.190.232
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.24
Name:	atod-g2.tm-4.office.com
Address: 52.96.222.216
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.88
Name:	atod-g2.tm-4.office.com
Address: 52.96.157.120
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:3407::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:2800::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:803::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:340b::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:85f::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:807::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:3404::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:284f::8