Robtex

Up: 13.32.172.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 13.32.172.0/25
Down right: 13.32.172.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
13.32.172.73	PTR	server-13-32-172-73.lhr62.r.cloudfront.net
13.32.172.73	A	qboap.slack.com
13.32.172.73	A	gtatldatapt12-gde6202.slack.com
13.32.172.91	PTR	server-13-32-172-91.dfw54.r.cloudfront.net
13.32.172.91	A	d3cylt212hhy9q.cloudfront.net
13.32.172.155	PTR	server-13-32-172-155.lhr62.r.cloudfront.net
13.32.172.155	A	server-13-32-172-155.dfw54.r.cloudfront.net
13.32.172.211	A+PTR	server-13-32-172-211.lhr62.r.cloudfront.net
13.32.172.211	A	d3ifbwheoxq15h.cloudfront.net