Robtex

Up: 64.81.138.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 64.81.138.0/25
Down right: 64.81.138.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.81.138.1	PTR	er1.chi1.speakeasy.net
64.81.138.3	PTR	smtp.tgrec.com
64.81.138.5	A+PTR	dsl081-138-005.chi1.dsl.speakeasy.net
64.81.138.6	A+PTR	dsl081-138-006.chi1.dsl.speakeasy.net
64.81.138.12	PTR	analog.majorpanic.org
64.81.138.12	A	smallplanetbigworld.com
64.81.138.13	A+PTR	dsl081-138-013.chi1.dsl.speakeasy.net
64.81.138.18	A+PTR	dsl081-138-018.chi1.dsl.speakeasy.net
64.81.138.23	A+PTR	dsl081-138-023.chi1.dsl.speakeasy.net
64.81.138.27	PTR	dsl081-138-027.chi1.dsl.speakeasy.net
64.81.138.27	A	platia.com
64.81.138.27	A	korolis.net
64.81.138.29	A+PTR	dsl081-138-029.chi1.dsl.speakeasy.net
64.81.138.35	A+PTR	dsl081-138-035.chi1.dsl.speakeasy.net
64.81.138.44	A+PTR	dsl081-138-044.chi1.dsl.speakeasy.net
64.81.138.45	A+PTR	dsl081-138-045.chi1.dsl.speakeasy.net
64.81.138.46	A+PTR	dsl081-138-046.chi1.dsl.speakeasy.net
64.81.138.59	A+PTR	dsl081-138-059.chi1.dsl.speakeasy.net
64.81.138.64	A+PTR	dsl081-138-064.chi1.dsl.speakeasy.net
64.81.138.65	A+PTR	dsl081-138-065.chi1.dsl.speakeasy.net
64.81.138.70	PTR	tonekids.com
64.81.138.75	PTR	plato.bluemaggottowel.com
64.81.138.76	A+PTR	dsl081-138-076.chi1.dsl.speakeasy.net
64.81.138.88	A+PTR	dsl081-138-088.chi1.dsl.speakeasy.net
64.81.138.97	PTR	dsl081-138-097.chi1.dsl.speakeasy.net
64.81.138.97	A	mail.tsschicago.com
64.81.138.97	A	tsschicago.com
64.81.138.98	A	www.trialhq.com
64.81.138.98	A	trialhq.com
64.81.138.115	PTR	athena.beakstar.com
64.81.138.118	A+PTR	dsl081-138-118.chi1.dsl.speakeasy.net
64.81.138.120	PTR	coachz.lpinternet.com
64.81.138.124	A+PTR	dsl081-138-124.chi1.dsl.speakeasy.net
64.81.138.129	PTR	dsl081-138-129.chi1.dsl.speakeasy.net
64.81.138.129	A	barringtonsports.org
64.81.138.129	A	transportationsoftwaresystems.com
64.81.138.130	A+PTR	dsl081-138-130.chi1.dsl.speakeasy.net
64.81.138.138	PTR	ns1.jcomserv.net
64.81.138.142	PTR	dsl081-138-142.chi1.dsl.speakeasy.net
64.81.138.142	A	zimbra.tssconnect.net
64.81.138.145	A+PTR	dsl081-138-145.chi1.dsl.speakeasy.net
64.81.138.167	A+PTR	dsl081-138-167.chi1.dsl.speakeasy.net
64.81.138.171	A+PTR	dsl081-138-171.chi1.dsl.speakeasy.net
64.81.138.172	A+PTR	dsl081-138-172.chi1.dsl.speakeasy.net
64.81.138.180	A+PTR	dsl081-138-180.chi1.dsl.speakeasy.net
64.81.138.183	A+PTR	dsl081-138-183.chi1.dsl.speakeasy.net
64.81.138.189	A+PTR	dsl081-138-189.chi1.dsl.speakeasy.net
64.81.138.194	PTR	dsl081-138-194.chi1.dsl.speakeasy.net
64.81.138.194	A	brotherhoodtrucking.com
64.81.138.195	A+PTR	dsl081-138-195.chi1.dsl.speakeasy.net
64.81.138.204	A+PTR	dsl081-138-204.chi1.dsl.speakeasy.net
64.81.138.214	A+PTR	dsl081-138-214.chi1.dsl.speakeasy.net
64.81.138.219	A+PTR	dsl081-138-219.chi1.dsl.speakeasy.net
64.81.138.221	A+PTR	dsl081-138-221.chi1.dsl.speakeasy.net
64.81.138.225	A+PTR	dsl081-138-225.chi1.dsl.speakeasy.net
64.81.138.233	A+PTR	dsl081-138-233.chi1.dsl.speakeasy.net