Robtex

Up: 71.13.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 71.13.64.0/23
Down right: 71.13.66.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
71.13.64.0	PTR	71-13-64-0.static.aldl.mi.charter.com
71.13.64.42	A+PTR	71-13-64-42.static.aldl.mi.charter.com
71.13.64.54	A+PTR	71-13-64-54.static.aldl.mi.charter.com
71.13.64.99	PTR	exchange.smb-t.com
71.13.64.101	PTR	bmail.smb-t.com
71.13.64.107	PTR	web20.smb-t.com
71.13.64.140	A+PTR	71-13-64-140.static.aldl.mi.charter.com
71.13.64.210	A	mail.crippsfontaine.com
71.13.64.230	A	mail.threadschurch.org
71.13.64.237	PTR	071-013-064-237.biz.spectrum.com
71.13.65.42	A	livoniatoolandlaser.com
71.13.65.42	A	steelexpressions.com
71.13.65.42	A	livoniatool.net
71.13.65.44	A	smtp.livoniatool.net
71.13.65.51	A+PTR	smtp.livoniatool.com
71.13.65.83	A+PTR	71-13-65-83.static.aldl.mi.charter.com
71.13.65.174	A	mail.shorelineortho.com
71.13.65.178	A+PTR	71-13-65-178.static.aldl.mi.charter.com
71.13.65.180	A+PTR	71-13-65-180.static.aldl.mi.charter.com
71.13.65.181	A+PTR	71-13-65-181.static.aldl.mi.charter.com
71.13.65.195	A	mail.bldhd.org
71.13.65.200	A+PTR	71-13-65-200.static.aldl.mi.charter.com
71.13.65.202	A	remote.mavcon.com
71.13.65.202	A	remote.mavconusa.com
71.13.65.202	A	mail.mavconusa.com
71.13.65.218	A	mail.midwestsidingonline.com
71.13.65.238	A	mail.jostinternational.com
71.13.66.3	A	centermedical.com
71.13.66.66	A+PTR	71-13-66-66.static.aldl.mi.charter.com
71.13.66.68	PTR	71-13-66-68.static.aldl.mi.charter.com
71.13.66.68	A	mail2.aghosp.com
71.13.66.69	A+PTR	71-13-66-69.static.aldl.mi.charter.com
71.13.66.69	A	email.aghosp.com
71.13.66.134	A+PTR	71-13-66-134.static.aldl.mi.charter.com
71.13.66.134	A	howardprinting.com
71.13.66.134	A	www.howardprinting.com
71.13.66.146	A+PTR	71-13-66-146.static.aldl.mi.charter.com
71.13.66.202	PTR	71-13-66-202.static.aldl.mi.charter.com
71.13.66.202	A	remote.lakeannumc.com
71.13.66.202	A	mail.lakeannumc.org
71.13.67.8	A+PTR	71-13-67-8.static.aldl.mi.charter.com
71.13.67.18	A+PTR	71-13-67-18.static.aldl.mi.charter.com
71.13.67.19	A+PTR	71-13-67-19.static.aldl.mi.charter.com
71.13.67.23	A+PTR	71-13-67-23.static.aldl.mi.charter.com
71.13.67.27	A+PTR	71-13-67-27.static.aldl.mi.charter.com
71.13.67.34	A+PTR	71-13-67-34.static.aldl.mi.charter.com
71.13.67.35	A+PTR	71-13-67-35.static.aldl.mi.charter.com
71.13.67.38	A+PTR	71-13-67-38.static.aldl.mi.charter.com
71.13.67.40	A+PTR	71-13-67-40.static.aldl.mi.charter.com
71.13.67.45	A+PTR	71-13-67-45.static.aldl.mi.charter.com
71.13.67.46	A	mail.bcapc.com
71.13.67.47	A+PTR	71-13-67-47.static.aldl.mi.charter.com
71.13.67.48	A+PTR	71-13-67-48.static.aldl.mi.charter.com
71.13.67.49	A+PTR	71-13-67-49.static.aldl.mi.charter.com
71.13.67.50	A+PTR	71-13-67-50.static.aldl.mi.charter.com
71.13.67.54	A+PTR	71-13-67-54.static.aldl.mi.charter.com
71.13.67.56	A+PTR	71-13-67-56.static.aldl.mi.charter.com
71.13.67.58	A+PTR	71-13-67-58.static.aldl.mi.charter.com
71.13.67.70	A+PTR	71-13-67-70.static.aldl.mi.charter.com
71.13.67.78	A+PTR	71-13-67-78.static.aldl.mi.charter.com
71.13.67.97	A+PTR	71-13-67-97.static.aldl.mi.charter.com
71.13.67.102	PTR	accu-moldinc.com
71.13.67.107	A+PTR	71-13-67-107.static.aldl.mi.charter.com
71.13.67.112	A+PTR	71-13-67-112.static.aldl.mi.charter.com
71.13.67.115	A+PTR	71-13-67-115.static.aldl.mi.charter.com
71.13.67.116	A+PTR	71-13-67-116.static.aldl.mi.charter.com
71.13.67.126	A+PTR	71-13-67-126.static.aldl.mi.charter.com
71.13.67.127	A+PTR	71-13-67-127.static.aldl.mi.charter.com
71.13.67.145	A+PTR	71-13-67-145.static.aldl.mi.charter.com
71.13.67.148	A+PTR	71-13-67-148.static.aldl.mi.charter.com
71.13.67.152	A+PTR	71-13-67-152.static.aldl.mi.charter.com
71.13.67.156	A+PTR	71-13-67-156.static.aldl.mi.charter.com
71.13.67.160	A+PTR	71-13-67-160.static.aldl.mi.charter.com
71.13.67.175	A+PTR	71-13-67-175.static.aldl.mi.charter.com
71.13.67.205	A+PTR	71-13-67-205.static.aldl.mi.charter.com
71.13.67.209	A+PTR	71-13-67-209.static.aldl.mi.charter.com
71.13.67.227	A	mail.intrepidpg.com
71.13.67.229	A+PTR	71-13-67-229.static.aldl.mi.charter.com
71.13.67.231	A+PTR	71-13-67-231.static.aldl.mi.charter.com
71.13.67.232	A+PTR	71-13-67-232.static.aldl.mi.charter.com
71.13.67.250	A+PTR	71-13-67-250.static.aldl.mi.charter.com
71.13.67.253	A+PTR	71-13-67-253.static.aldl.mi.charter.com
71.13.67.254	A+PTR	71-13-67-254.static.aldl.mi.charter.com