shell:$ nslookup -timeout=2 -retry=1 'c.amazon-adsystem.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
c.amazon-adsystem.com	canonical name = d1ykf07e75w7ss.cloudfront.net.
Name:	d1ykf07e75w7ss.cloudfront.net
Address: 13.249.136.91