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

Non-authoritative answer:
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: 52.96.170.72
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.216
Name:	atod-g2.tm-4.office.com
Address: 52.96.157.72
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.88
Name:	atod-g2.tm-4.office.com
Address: 52.96.163.8
Name:	atod-g2.tm-4.office.com
Address: 52.96.66.168
Name:	atod-g2.tm-4.office.com
Address: 52.96.222.216
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.72
atod-g2.tm-4.office.com	canonical name = autod.ms-acdc-autod.office.com.
Name:	autod.ms-acdc-autod.office.com
Address: 2603:1036:304:872::8
Name:	autod.ms-acdc-autod.office.com
Address: 2603:1036:304:2851::8
Name:	autod.ms-acdc-autod.office.com
Address: 2603:1036:304:838::8
Name:	autod.ms-acdc-autod.office.com
Address: 2603:1036:304:85f::8