Robtex

Up: 13.227.220.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 13.227.221.0/25
Down right: 13.227.221.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
13.227.221.32	PTR	server-13-227-221-32.ams54.r.cloudfront.net
13.227.221.74	PTR	server-13-227-221-74.ams54.r.cloudfront.net
13.227.221.74	A	cockroachdb.slack.com
13.227.221.74	A	aigent.slack.com
13.227.221.90	A+PTR	server-13-227-221-90.ams54.r.cloudfront.net
13.227.221.90	A	localdb-ip-daily.brightcloud.com
13.227.221.191	A+PTR	server-13-227-221-191.ams54.r.cloudfront.net
13.227.221.191	A	d1zf2p7ylo2ros.cloudfront.net