Robtex

Up: 64.140.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 64.140.64.0/20
Down right: 64.140.80.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.140.65.162	PTR	sycs.com
64.140.66.33	PTR	cetmail01.cetenv.com
64.140.66.34	PTR	cetmail01.cetenv.com
64.140.66.162	PTR	collegeinvest.org
64.140.66.166	PTR	www.prepaidtuition.org
64.140.66.194	PTR	colocollect.com
64.140.66.200	PTR	mail.mjfirm.com
64.140.66.201	A	www.colocollect.com
64.140.71.78	PTR	power-resou.edge1.denver1.level3.net
64.140.72.19	PTR	sirenza.com
64.140.72.158	PTR	mail.directnet.us
64.140.72.158	A	kvm-switch.us
64.140.72.158	A	www.kvm-switch.us
64.140.73.132	PTR	mail.johnsonautoplaza.com
64.140.77.39	PTR	rygl.axistangent.net
64.140.77.101	PTR	ns.rmac.net
64.140.77.194	PTR	www.ams-web.com
64.140.78.5	PTR	rockymtn.fbci.org
64.140.78.163	PTR	www.iisnet.com
64.140.81.66	PTR	tpmms1.tpmllclaw.com
64.140.81.150	A	relay2.clairedineenlaw.com
64.140.81.194	PTR	mail.envisionco.org
64.140.81.235	PTR	mail.sundialscheduling.com
64.140.81.235	A	mail.turbodesigns.net
64.140.82.1	PTR	drake-tech-centre.mbi.com
64.140.82.33	PTR	64-140-82-33.host.mbi.com
64.140.82.35	PTR	64-140-82-35.host.mbi.com
64.140.82.98	PTR	mail.sca-ins.com
64.140.82.228	PTR	mainmaker.promote-it.com
64.140.83.194	PTR	ns1.pcmedicalllc.com
64.140.84.121	A	advancedmerchantservices.com
64.140.85.2	PTR	mail.ctgusa.com
64.140.85.3	PTR	mail.bfca.com
64.140.85.98	PTR	mail.lovante.com
64.140.85.227	PTR	mail.mimvista.com
64.140.85.228	A	csitko.yi.org
64.140.86.75	A	mail.veracept.com
64.140.86.75	A	mail.regionalimaging.com
64.140.86.75	A	veracept.com