Robtex

Up: 52.85.81.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 52.85.81.128/26
Down right: 52.85.81.192/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
52.85.81.129	A+PTR	server-52-85-81-129.lax3.r.cloudfront.net
52.85.81.152	PTR	server-52-85-81-152.lax3.r.cloudfront.net
52.85.81.162	PTR	server-52-85-81-162.lax3.r.cloudfront.net
52.85.81.169	PTR	server-52-85-81-169.lax3.r.cloudfront.net
52.85.81.174	A	bluecat.slack.com
52.85.81.174	A	yj-yahoo-jp-guest.slack.com
52.85.81.174	A	spts-red.slack.com
52.85.81.192	PTR	server-52-85-81-192.lax3.r.cloudfront.net
52.85.81.192	A	mts-huawei-video.slack.com
52.85.81.192	A	cryptocommunityasia.slack.com
52.85.81.211	PTR	server-52-85-81-211.atl56.r.cloudfront.net
52.85.81.211	A	mvd.marystephan.smugmug.com
52.85.81.211	A	mcxplugtests.slack.com
52.85.81.219	A+PTR	server-52-85-81-219.lax3.r.cloudfront.net
52.85.81.225	A+PTR	server-52-85-81-225.lax3.r.cloudfront.net
52.85.81.227	A	rhccommunityenergy.slack.com
52.85.81.227	A	dengjiaqi.slack.com
52.85.81.227	A	hewlett.slack.com
52.85.81.233	A	johannybecerra.smugmug.com
52.85.81.233	A	tarexyhzema105.smugmug.com
52.85.81.239	A+PTR	server-52-85-81-239.lax3.r.cloudfront.net
52.85.81.241	A+PTR	server-52-85-81-241.lax3.r.cloudfront.net
52.85.81.250	PTR	server-52-85-81-250.lax3.r.cloudfront.net