Robtex

Up: 64.140.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 64.140.16.0/22
Down right: 64.140.20.0/22

IP	Type	Hostname
64.140.16.99	PTR	www.plankey.com
64.140.16.100	PTR	www.xlplans.com
64.140.16.135	PTR	64-140-16-135-digital.icg.net
64.140.17.80	PTR	mail.indexc.com
64.140.17.83	A	mail.digcohelpdesk.com
64.140.17.84	A	mail.indexc.com
64.140.18.18	PTR	bpiohio.com
64.140.18.33	PTR	percipia.com
64.140.18.34	PTR	percipia.net
64.140.18.36	PTR	mail.percipia.com
64.140.18.189	A	lsq-3-2-0-50.edge1.cleveland1.level3.net
64.140.18.196	PTR	mgr.optimumcompanies.com
64.140.19.4	PTR	mail.cons-inc.com
64.140.19.133	PTR	ottcom.com
64.140.19.166	A+PTR	mail.olysteel.com
64.140.20.51	PTR	64-140-20-51.xplorations.net
64.140.21.2	A+PTR	fw01.wkyc.com
64.140.21.7	A	wkyc-lclnscvi.wkyc.com
64.140.21.170	PTR	akroncantonfoodbank.org
64.140.22.47	PTR	ns2.ibeamsolutions.com