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

Non-authoritative answer:
assets.heroku.com	canonical name = s3.amazonaws.com.
Name:	s3.amazonaws.com
Address: 52.217.116.120
Name:	s3.amazonaws.com
Address: 52.217.206.96
Name:	s3.amazonaws.com
Address: 16.15.192.53
Name:	s3.amazonaws.com
Address: 16.15.181.233
Name:	s3.amazonaws.com
Address: 54.231.165.240
Name:	s3.amazonaws.com
Address: 16.182.106.80
Name:	s3.amazonaws.com
Address: 16.182.35.96
Name:	s3.amazonaws.com
Address: 52.217.17.126