Robtex

Up: 13.33.232.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 13.33.236.0/23
Down right: 13.33.238.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
13.33.236.48	PTR	server-13-33-236-48.mad51.r.cloudfront.net
13.33.236.48	A	proserve.awsapps.com
13.33.236.48	A	hornet.awsapps.com
13.33.237.59	PTR	server-13-33-237-59.mad51.r.cloudfront.net
13.33.237.76	A+PTR	server-13-33-237-76.mad51.r.cloudfront.net
13.33.237.76	A	membership.awsapps.com
13.33.237.76	A	sphero.awsapps.com
13.33.237.133	A+PTR	server-13-33-237-133.mad51.r.cloudfront.net
13.33.237.149	PTR	server-13-33-237-149.mad51.r.cloudfront.net
13.33.237.149	A	canada.awsapps.com
13.33.237.149	A	proactis.awsapps.com
13.33.238.170	A+PTR	server-13-33-238-170.mad51.r.cloudfront.net
13.33.238.186	PTR	server-13-33-238-186.mad51.r.cloudfront.net
13.33.238.186	A	bombay.awsapps.com
13.33.238.186	A	presto.awsapps.com
13.33.239.63	PTR	server-13-33-239-63.mad51.r.cloudfront.net
13.33.239.63	A	prosport.awsapps.com
13.33.239.63	A	clearview.awsapps.com
13.33.239.232	A+PTR	server-13-33-239-232.mad51.r.cloudfront.net