shell:$ nslookup -timeout=2 -retry=1 'assets.zendesk.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
assets.zendesk.com	canonical name = cf.zdassets.com.
Name:	cf.zdassets.com
Address: 216.198.53.3
Name:	cf.zdassets.com
Address: 216.198.54.3