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

Non-authoritative answer:
cdn.arcgis.com	canonical name = dxq870kxibfkw.cloudfront.net.
Name:	dxq870kxibfkw.cloudfront.net
Address: 108.156.172.31
Name:	dxq870kxibfkw.cloudfront.net
Address: 108.156.172.75
Name:	dxq870kxibfkw.cloudfront.net
Address: 108.156.172.32
Name:	dxq870kxibfkw.cloudfront.net
Address: 108.156.172.21