Robtex

Up: 52.84.1.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 52.84.1.128/26
Down right: 52.84.1.192/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
52.84.1.139	PTR	server-52-84-1-139.ord54.r.cloudfront.net
52.84.1.139	A	thexcw7s.micpn.com
52.84.1.139	A	cshnebrb.micpn.com
52.84.1.145	A+PTR	server-52-84-1-145.ord54.r.cloudfront.net
52.84.1.146	A+PTR	server-52-84-1-146.ord54.r.cloudfront.net
52.84.1.146	A	acumensolutions.slack.com
52.84.1.146	A	gatewaystaff.slack.com
52.84.1.159	A+PTR	server-52-84-1-159.ord54.r.cloudfront.net
52.84.1.167	A+PTR	server-52-84-1-167.ord54.r.cloudfront.net
52.84.1.167	A	skyit.site.scribblelive.com
52.84.1.167	A	liveblog.tg24.sky.it
52.84.1.175	A+PTR	server-52-84-1-175.ord54.r.cloudfront.net
52.84.1.175	A	skpcdlab.slack.com
52.84.1.177	A+PTR	server-52-84-1-177.ord54.r.cloudfront.net
52.84.1.180	A+PTR	server-52-84-1-180.ord54.r.cloudfront.net
52.84.1.186	A+PTR	server-52-84-1-186.ord54.r.cloudfront.net
52.84.1.191	A+PTR	server-52-84-1-191.ord54.r.cloudfront.net
52.84.1.203	A+PTR	server-52-84-1-203.ord54.r.cloudfront.net
52.84.1.204	A+PTR	server-52-84-1-204.ord54.r.cloudfront.net
52.84.1.205	A+PTR	server-52-84-1-205.ord54.r.cloudfront.net
52.84.1.211	A+PTR	server-52-84-1-211.ord54.r.cloudfront.net
52.84.1.229	A+PTR	server-52-84-1-229.ord54.r.cloudfront.net
52.84.1.236	A+PTR	server-52-84-1-236.ord54.r.cloudfront.net
52.84.1.246	PTR	server-52-84-1-246.ord54.r.cloudfront.net
52.84.1.253	PTR	server-52-84-1-253.ord54.r.cloudfront.net
52.84.1.253	A	reezernigeria.slack.com
52.84.1.253	A	ss-ww.slack.com
52.84.1.254	A+PTR	server-52-84-1-254.ord54.r.cloudfront.net
52.84.1.254	A	liveblogs.hgtv.ca
52.84.1.254	A	wptz.scribblelive.com