Robtex

Up: 13.33.236.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 13.33.237.0/25
Down right: 13.33.237.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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