Robtex

Up: 52.84.28.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 52.84.28.0/25
Down right: 52.84.28.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
52.84.28.70	A+PTR	server-52-84-28-70.ewr50.r.cloudfront.net
52.84.28.70	A	d65xh5bqinov4.cloudfront.net
52.84.28.75	A+PTR	server-52-84-28-75.ewr50.r.cloudfront.net
52.84.28.76	A+PTR	server-52-84-28-76.ewr50.r.cloudfront.net
52.84.28.78	A+PTR	server-52-84-28-78.ewr50.r.cloudfront.net
52.84.28.109	A+PTR	server-52-84-28-109.ewr50.r.cloudfront.net
52.84.28.114	A+PTR	server-52-84-28-114.ewr50.r.cloudfront.net
52.84.28.120	A	slack-www-dev-hhvm-01f0c0a5421c1f37a.slack.com
52.84.28.125	A+PTR	server-52-84-28-125.ewr50.r.cloudfront.net
52.84.28.125	A	terryink.smugmug.com
52.84.28.145	A+PTR	server-52-84-28-145.ewr50.r.cloudfront.net
52.84.28.145	A	mfoto.smugmug.com
52.84.28.145	A	khansen.smugmug.com
52.84.28.221	A+PTR	server-52-84-28-221.ewr50.r.cloudfront.net
52.84.28.230	A+PTR	server-52-84-28-230.ewr50.r.cloudfront.net