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

Non-authoritative answer:
auth.three.co.uk	canonical name = prod-auth-3uk-cd-l7sr7tmgkffsuzzv.edge.tenants.eu.auth0.com.
Name:	prod-auth-3uk-cd-l7sr7tmgkffsuzzv.edge.tenants.eu.auth0.com
Address: 104.17.192.231
Name:	prod-auth-3uk-cd-l7sr7tmgkffsuzzv.edge.tenants.eu.auth0.com
Address: 104.18.159.162
Name:	prod-auth-3uk-cd-l7sr7tmgkffsuzzv.edge.tenants.eu.auth0.com
Address: 2606:4700::6811:c0e7
Name:	prod-auth-3uk-cd-l7sr7tmgkffsuzzv.edge.tenants.eu.auth0.com
Address: 2606:4700::6812:9fa2