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: 52.96.226.136
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.120
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.248
Name:	atod-g2.tm-4.office.com
Address: 52.96.163.8
Name:	atod-g2.tm-4.office.com
Address: 52.96.156.24
Name:	atod-g2.tm-4.office.com
Address: 52.96.73.56
Name:	atod-g2.tm-4.office.com
Address: 52.96.163.24
Name:	atod-g2.tm-4.office.com
Address: 52.96.79.168
atod-g2.tm-4.office.com	canonical name = autod.ms-acdc-autod.office.com.
Name:	autod.ms-acdc-autod.office.com
Address: 2603:1036:304:2857::8
Name:	autod.ms-acdc-autod.office.com
Address: 2603:1036:304:85e::8
Name:	autod.ms-acdc-autod.office.com
Address: 2603:1036:304:805::8
Name:	autod.ms-acdc-autod.office.com
Address: 2603:1036:304:3407::8