shell:$ nslookup -timeout=2 -retry=1 'js.adsrvr.org'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
js.adsrvr.org	canonical name = dg2iu7dxxehbo.cloudfront.net.
Name:	dg2iu7dxxehbo.cloudfront.net
Address: 18.172.135.121