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: 172.64.153.85
Name:	prod-auth-3uk-cd-l7sr7tmgkffsuzzv.edge.tenants.eu.auth0.com
Address: 104.18.34.171
Name:	prod-auth-3uk-cd-l7sr7tmgkffsuzzv.edge.tenants.eu.auth0.com
Address: 2a06:98c1:3102::6812:22ab
Name:	prod-auth-3uk-cd-l7sr7tmgkffsuzzv.edge.tenants.eu.auth0.com
Address: 2a06:98c1:3101::ac40:9955