Robtex

Up: 64.140.64.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 64.140.64.0/21
Down right: 64.140.72.0/21

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