Robtex

Up: 13.33.232.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 13.33.233.0/25
Down right: 13.33.233.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
13.33.233.54	A+PTR	server-13-33-233-54.mad51.r.cloudfront.net
13.33.233.78	PTR	server-13-33-233-78.mad51.r.cloudfront.net
13.33.233.78	A	zabbix.awsapps.com
13.33.233.78	A	rework.awsapps.com
13.33.233.82	PTR	server-13-33-233-82.mad51.r.cloudfront.net
13.33.233.143	PTR	server-13-33-233-143.mad51.r.cloudfront.net
13.33.233.230	A+PTR	server-13-33-233-230.mad51.r.cloudfront.net
13.33.233.230	A	varuna.awsapps.com
13.33.233.230	A	washburn.awsapps.com