shell:$ nslookup -timeout=2 -retry=1 'autodiscover.three.co.uk'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
autodiscover.three.co.uk	canonical name = autodiscover.outlook.com.
autodiscover.outlook.com	canonical name = atod-g2.tm-4.office.com.
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.88
Name:	atod-g2.tm-4.office.com
Address: 52.96.164.152
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.216
Name:	atod-g2.tm-4.office.com
Address: 52.96.157.152
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.184
Name:	atod-g2.tm-4.office.com
Address: 52.96.191.232
Name:	atod-g2.tm-4.office.com
Address: 52.96.163.40
Name:	atod-g2.tm-4.office.com
Address: 52.96.239.184
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:2852::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:3406::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:804::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:3407::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:806::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:284c::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:805::8
Name:	atod-g2.tm-4.office.com
Address: 2603:1036:304:83f::8