Robtex

Up: 143.204.8.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 143.204.9.0/25
Down right: 143.204.9.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
143.204.9.32	A+PTR	server-143-204-9-32.mxp64.r.cloudfront.net
143.204.9.158	A+PTR	server-143-204-9-158.mxp64.r.cloudfront.net
143.204.9.158	A	urbanmentalhealth.slack.com
143.204.9.158	A	gruszkowo.slack.com