Robtex

Up: 13.33.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 13.33.16.0/23
Down right: 13.33.18.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
13.33.16.16	PTR	server-13-33-16-16.arn53.r.cloudfront.net
13.33.16.16	A	telummedia.slack.com
13.33.16.27	A	release.slack.com
13.33.16.27	A	skillfactory-ml3.slack.com
13.33.16.50	A+PTR	server-13-33-16-50.arn53.r.cloudfront.net
13.33.16.50	A	hci-xio4084.slack.com
13.33.16.59	A+PTR	server-13-33-16-59.arn53.r.cloudfront.net
13.33.16.59	A	dtvlatamott.slack.com
13.33.16.59	A	rakutenrewards.slack.com
13.33.16.122	A+PTR	server-13-33-16-122.arn53.r.cloudfront.net
13.33.16.122	A	lru9cbct.micpn.com
13.33.16.122	A	0mmvoxva.micpn.com
13.33.16.132	A	zelayan.slack.com
13.33.16.132	A	swarovski-csi.slack.com
13.33.16.178	A	redmineparty.slack.com
13.33.16.178	A	ctleelab.slack.com
13.33.16.209	A	walletsberbank.slack.com
13.33.16.209	A	firmsecurehq.slack.com
13.33.16.209	A	gridinsoft-teamgroup.slack.com
13.33.16.240	A	asjads.slack.com
13.33.17.24	A	eloyjensen615.dmusic.net
13.33.17.41	A	eloyjensen615.dmusic.net
13.33.17.48	PTR	server-13-33-17-48.arn53.r.cloudfront.net
13.33.17.51	A	eloyjensen615.dmusic.net
13.33.17.52	A	dzbpszcma1hnj.cloudfront.net
13.33.17.62	A+PTR	server-13-33-17-62.arn53.r.cloudfront.net
13.33.17.62	A	d338f1swfvv6vp.cloudfront.net
13.33.17.104	A	d2y48fbrntiqyp.cloudfront.net
13.33.17.119	A	dzbpszcma1hnj.cloudfront.net
13.33.17.131	PTR	server-13-33-17-131.arn53.r.cloudfront.net
13.33.17.133	A	dzbpszcma1hnj.cloudfront.net
13.33.17.177	A	dzbpszcma1hnj.cloudfront.net
13.33.17.196	A+PTR	server-13-33-17-196.arn53.r.cloudfront.net
13.33.17.200	PTR	server-13-33-17-200.arn53.r.cloudfront.net
13.33.17.204	A	eloyjensen615.dmusic.net
13.33.17.207	A+PTR	server-13-33-17-207.arn53.r.cloudfront.net
13.33.17.222	PTR	server-13-33-17-222.arn53.r.cloudfront.net
13.33.17.240	A	quintype-dropbox.s3-accelerate.amazonaws.com
13.33.18.16	A+PTR	server-13-33-18-16.arn53.r.cloudfront.net
13.33.18.24	A+PTR	server-13-33-18-24.arn53.r.cloudfront.net
13.33.18.24	A	scarsdaleflorists.com
13.33.18.25	A+PTR	server-13-33-18-25.arn53.r.cloudfront.net
13.33.18.25	A	d1eu5zmxuvclnq.cloudfront.net
13.33.18.38	A+PTR	server-13-33-18-38.arn53.r.cloudfront.net
13.33.18.38	A	ingsystem.com
13.33.18.43	A+PTR	server-13-33-18-43.arn53.r.cloudfront.net
13.33.18.45	A+PTR	server-13-33-18-45.arn53.r.cloudfront.net
13.33.18.48	A+PTR	server-13-33-18-48.arn53.r.cloudfront.net
13.33.18.66	A+PTR	server-13-33-18-66.arn53.r.cloudfront.net
13.33.18.66	A	kms-california.mx
13.33.18.66	A	d192gvw4ub21e2.cloudfront.net
13.33.18.68	A+PTR	server-13-33-18-68.arn53.r.cloudfront.net
13.33.18.68	A	drakestlouis.com
13.33.18.76	A	d1qp0mm5ynlv26.cloudfront.net
13.33.18.77	A+PTR	server-13-33-18-77.arn53.r.cloudfront.net
13.33.18.77	A	d192gvw4ub21e2.cloudfront.net
13.33.18.80	A+PTR	server-13-33-18-80.arn53.r.cloudfront.net
13.33.18.80	A	scarsdaleflorists.com
13.33.18.80	A	ppc.constantcontact.com
13.33.18.81	A+PTR	server-13-33-18-81.arn53.r.cloudfront.net
13.33.18.81	A	ingsystem.com
13.33.18.87	A+PTR	server-13-33-18-87.arn53.r.cloudfront.net
13.33.18.93	A+PTR	server-13-33-18-93.arn53.r.cloudfront.net
13.33.18.97	A+PTR	server-13-33-18-97.arn53.r.cloudfront.net
13.33.18.97	A	kms-california.mx
13.33.18.102	A+PTR	server-13-33-18-102.arn53.r.cloudfront.net
13.33.18.102	A	ppc.constantcontact.com
13.33.18.108	A+PTR	server-13-33-18-108.arn53.r.cloudfront.net
13.33.18.108	A	drakestlouis.com
13.33.18.118	A+PTR	server-13-33-18-118.arn53.r.cloudfront.net
13.33.18.118	A	scarsdaleflorists.com
13.33.18.130	A+PTR	server-13-33-18-130.arn53.r.cloudfront.net
13.33.18.130	A	kms-california.mx
13.33.18.131	A+PTR	server-13-33-18-131.arn53.r.cloudfront.net
13.33.18.131	A	d192gvw4ub21e2.cloudfront.net
13.33.18.135	A+PTR	server-13-33-18-135.arn53.r.cloudfront.net
13.33.18.135	A	ingsystem.com
13.33.18.135	A	d1qp0mm5ynlv26.cloudfront.net
13.33.18.144	A+PTR	server-13-33-18-144.arn53.r.cloudfront.net
13.33.18.144	A	scarsdaleflorists.com
13.33.18.144	A	ppc.constantcontact.com
13.33.18.145	A	d1qp0mm5ynlv26.cloudfront.net
13.33.18.150	A+PTR	server-13-33-18-150.arn53.r.cloudfront.net
13.33.18.169	A+PTR	server-13-33-18-169.arn53.r.cloudfront.net
13.33.18.181	A+PTR	server-13-33-18-181.arn53.r.cloudfront.net
13.33.18.181	A	ingsystem.com
13.33.18.181	A	kms-california.mx
13.33.18.194	A	d2lnipu5rsejez.cloudfront.net
13.33.18.203	A	d1qp0mm5ynlv26.cloudfront.net
13.33.18.216	A+PTR	server-13-33-18-216.arn53.r.cloudfront.net
13.33.18.216	A	drakestlouis.com
13.33.18.217	A+PTR	server-13-33-18-217.arn53.r.cloudfront.net
13.33.18.219	A+PTR	server-13-33-18-219.arn53.r.cloudfront.net
13.33.18.231	A+PTR	server-13-33-18-231.arn53.r.cloudfront.net
13.33.18.231	A	d192gvw4ub21e2.cloudfront.net
13.33.18.239	A+PTR	server-13-33-18-239.arn53.r.cloudfront.net
13.33.18.239	A	drakestlouis.com
13.33.18.239	A	ppc.constantcontact.com
13.33.19.9	A+PTR	server-13-33-19-9.arn53.r.cloudfront.net
13.33.19.159	A	techglobalis.awsapps.com
13.33.19.236	A	d21gvuxoazqygm.cloudfront.net