Robtex

Up: 13.32.89.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 13.32.89.0/26
Down right: 13.32.89.64/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
13.32.89.26	A+PTR	server-13-32-89-26.mad51.r.cloudfront.net
13.32.89.40	A+PTR	server-13-32-89-40.mad51.r.cloudfront.net
13.32.89.43	A+PTR	server-13-32-89-43.mad51.r.cloudfront.net
13.32.89.45	PTR	server-13-32-89-45.mad51.r.cloudfront.net
13.32.89.48	A+PTR	server-13-32-89-48.mad51.r.cloudfront.net
13.32.89.50	A+PTR	server-13-32-89-50.mad51.r.cloudfront.net
13.32.89.56	PTR	server-13-32-89-56.mad51.r.cloudfront.net
13.32.89.69	A+PTR	server-13-32-89-69.mad51.r.cloudfront.net
13.32.89.110	PTR	server-13-32-89-110.mad51.r.cloudfront.net
13.32.89.124	PTR	server-13-32-89-124.mad51.r.cloudfront.net
13.32.89.124	A	bigbox.awsapps.com
13.32.89.124	A	seekasia.awsapps.com