Robtex

Up: 52.84.28.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 52.84.28.0/24
Down right: 52.84.29.0/24
(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
52.84.29.16	A+PTR	server-52-84-29-16.ewr50.r.cloudfront.net
52.84.29.23	A+PTR	server-52-84-29-23.ewr50.r.cloudfront.net
52.84.29.26	A+PTR	server-52-84-29-26.ewr50.r.cloudfront.net
52.84.29.35	A+PTR	server-52-84-29-35.ewr50.r.cloudfront.net
52.84.29.49	PTR	server-52-84-29-49.lax53.r.cloudfront.net
52.84.29.49	A	server-52-84-29-49.ewr50.r.cloudfront.net
52.84.29.50	A+PTR	server-52-84-29-50.ewr50.r.cloudfront.net
52.84.29.51	A+PTR	server-52-84-29-51.ewr50.r.cloudfront.net
52.84.29.54	A+PTR	server-52-84-29-54.ewr50.r.cloudfront.net
52.84.29.90	A+PTR	server-52-84-29-90.ewr50.r.cloudfront.net
52.84.29.92	A+PTR	server-52-84-29-92.ewr50.r.cloudfront.net
52.84.29.99	PTR	server-52-84-29-99.ewr50.r.cloudfront.net
52.84.29.100	A+PTR	server-52-84-29-100.ewr50.r.cloudfront.net
52.84.29.100	A	countrylife.onthemarket.com
52.84.29.109	A	d2xecrlms6lq36.cloudfront.net
52.84.29.125	A+PTR	server-52-84-29-125.ewr50.r.cloudfront.net
52.84.29.151	A+PTR	server-52-84-29-151.ewr50.r.cloudfront.net
52.84.29.165	A+PTR	server-52-84-29-165.ewr50.r.cloudfront.net
52.84.29.169	A+PTR	server-52-84-29-169.ewr50.r.cloudfront.net
52.84.29.175	A+PTR	server-52-84-29-175.ewr50.r.cloudfront.net
52.84.29.175	A	media5.artspace.com
52.84.29.175	A	media2.artspace.com
52.84.29.176	A+PTR	server-52-84-29-176.ewr50.r.cloudfront.net
52.84.29.182	PTR	server-52-84-29-182.ewr50.r.cloudfront.net
52.84.29.182	A	ndb-api-a.bpsgameserver.com
52.84.29.213	PTR	server-52-84-29-213.ewr50.r.cloudfront.net
52.84.29.213	A	mustardmaze.slack.com
52.84.29.213	A	sa-intranet.slack.com
52.84.29.225	A+PTR	server-52-84-29-225.ewr50.r.cloudfront.net
52.84.29.228	A+PTR	server-52-84-29-228.ewr50.r.cloudfront.net
52.84.29.228	A	d2n8v3vs7k0mod.cloudfront.net
52.84.29.229	A+PTR	server-52-84-29-229.ewr50.r.cloudfront.net
52.84.29.230	PTR	server-52-84-29-230.lax53.r.cloudfront.net
52.84.29.230	A	server-52-84-29-230.ewr50.r.cloudfront.net
52.84.29.238	A+PTR	server-52-84-29-238.ewr50.r.cloudfront.net
52.84.29.246	A	typetoread.com