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

Non-authoritative answer:
help.ubuntu.com	canonical name = is-content-cache.canonical.com.
Name:	is-content-cache.canonical.com
Address: 91.189.91.49
Name:	is-content-cache.canonical.com
Address: 185.125.190.17
Name:	is-content-cache.canonical.com
Address: 185.125.190.18
Name:	is-content-cache.canonical.com
Address: 91.189.91.48
Name:	is-content-cache.canonical.com
Address: 2001:67c:1562::24
Name:	is-content-cache.canonical.com
Address: 2620:2d:4000:1::2b
Name:	is-content-cache.canonical.com
Address: 2620:2d:4000:1::2a
Name:	is-content-cache.canonical.com
Address: 2001:67c:1562::23