Robtex

Up: 64.140.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 64.140.0.0/21
Down right: 64.140.8.0/21

IP	Type	Hostname
64.140.0.75	PTR	ast.org
64.140.1.98	PTR	ck-tek.com
64.140.1.117	PTR	ck-tek.com
64.140.1.162	PTR	co-switch.axistangent.net
64.140.1.163	PTR	rygl.axistangent.net
64.140.1.170	A	diviniadesign.com
64.140.2.69	PTR	www.whit.org
64.140.2.70	PTR	whit.org
64.140.2.82	PTR	mail.kellin.net
64.140.2.98	A	prca-online.net
64.140.2.98	A	prca-online.org
64.140.2.99	A	stage.prorodeo.com
64.140.2.99	A	www2.prorodeo.org
64.140.2.164	PTR	mailgate.omf.org
64.140.2.164	A	serveasia.net
64.140.2.230	A+PTR	littletonemail.flairdata.com
64.140.2.252	PTR	k2.cyrt.org
64.140.3.227	PTR	atrixlabs.com
64.140.3.241	PTR	mail.tolmar.com
64.140.4.68	PTR	mail.rmsboulder.com
64.140.4.68	A	mail.team3stripes.com
64.140.4.93	PTR	public.cworxs.com
64.140.5.3	PTR	dns4.ike.com
64.140.5.194	A	mail.lacunaresearch.com
64.140.5.194	A	64-140-5-194.icg.net
64.140.5.198	A	bluesemiconductors.com
64.140.5.198	A	64-140-5-198.icg.net
64.140.6.194	A	mail.lrflegal.com
64.140.7.157	A	t1-3-1-0-1-28.edge1.denver1.level3.net
64.140.8.129	PTR	server.wilkinsonfirm.net
64.140.8.190	PTR	www.optifaciosoftware.com
64.140.8.220	PTR	webmail.heritageproperty.com
64.140.8.222	PTR	mail.heritageproperty.com
64.140.10.163	PTR	mail.pinnacledatasystems.com
64.140.11.165	PTR	exchange.aiidealer.com
64.140.11.165	PTR	exchange.medcentermazda.com
64.140.11.165	PTR	mail.medcentermazda.com
64.140.12.2	A+PTR	gw.hfsllp.com
64.140.12.4	A+PTR	mail.hfsllp.com
64.140.12.4	A	prophitt.com
64.140.12.4	A	border.hfsllp.com
64.140.12.229	PTR	mail.strutservicesgroup.com
64.140.13.100	PTR	email.danielcorp.net
64.140.13.100	A	notes.danielrealty.com
64.140.13.115	A	mail.danielcorp.net
64.140.14.200	PTR	mail.atlantaparent.com
64.140.14.201	PTR	www.atlantaparent.com
64.140.15.38	PTR	auditeconline.icg.net
64.140.15.134	PTR	tw-border.core.teklinks.com
64.140.15.174	PTR	mail.pinnacledatasystems.com
64.140.15.226	PTR	server.wilkinsonfirm.net