Robtex

Up: 52.85.206.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 52.85.206.0/25
Down right: 52.85.206.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
52.85.206.89	PTR	server-52-85-206-89.dfw50.r.cloudfront.net
52.85.206.89	A	mvideo-backoffice.slack.com
52.85.206.89	A	ibm-cloud-tech.slack.com
52.85.206.213	A+PTR	server-52-85-206-213.dfw50.r.cloudfront.net