Robtex

Up: 64.6.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 64.6.160.0/20
Down right: 64.6.176.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.6.160.98	A+PTR	mail.wirtzinsurance.com
64.6.160.98	A	mail.wirtzrealty.com
64.6.160.98	A	mail.bsgi401k.com
64.6.161.35	A	ip-64-6-161-35.chi.megapath.net
64.6.161.106	A	mail2.acghq.org
64.6.161.106	A	mail.acghq.org
64.6.161.142	A	mail.wacchicago.com
64.6.161.203	A	mail.corecap.com
64.6.164.218	A	pcra.commute.org
64.6.165.27	A	ip-64-6-165-27.iad.megapath.net
64.6.166.134	A	usacinc.com
64.6.166.150	A	mail.edvotek.com
64.6.167.3	PTR	ip-64-6-167-3.static.megapath.net
64.6.167.3	A	mail.springerpub.com
64.6.167.148	A	fax.teamone2one.com
64.6.167.149	A	host.mailvisor.com
64.6.167.150	A	webmail.teamone2one.com
64.6.172.19	A	ip-64-6-172-19.den.megapath.net
64.6.172.236	A	ip-64-6-172-236.den.megapath.net
64.6.174.250	A	mail.spineworksmedical.com
64.6.174.250	A	ip-64-6-174-250.aus.megapath.net
64.6.175.21	A	ip-64-6-175-21.dfw.megapath.net
64.6.175.28	A	ip-64-6-175-28.dfw.megapath.net
64.6.175.30	A	ip-64-6-175-30.dfw.megapath.net
64.6.175.33	A+PTR	ip-64-6-175-33.dfw.megapath.net
64.6.175.66	A+PTR	ip-64-6-175-66.dfw.megapath.net
64.6.175.68	A	ip-64-6-175-68.dfw.megapath.net
64.6.175.83	A	ip-64-6-175-83.dfw.megapath.net
64.6.175.92	A	ip-64-6-175-92.dfw.megapath.net
64.6.175.106	A	ip-64-6-175-106.dfw.megapath.net
64.6.175.126	A	ip-64-6-175-126.dfw.megapath.net
64.6.175.132	A	ip-64-6-175-132.dfw.megapath.net
64.6.175.149	A	ip-64-6-175-149.dfw.megapath.net
64.6.175.167	A	ip-64-6-175-167.dfw.megapath.net
64.6.175.173	A	ip-64-6-175-173.dfw.megapath.net
64.6.175.181	A	ip-64-6-175-181.dfw.megapath.net
64.6.175.205	A	ip-64-6-175-205.dfw.megapath.net
64.6.175.220	A	ip-64-6-175-220.dfw.megapath.net
64.6.175.237	A	ip-64-6-175-237.dfw.megapath.net
64.6.175.243	A	ip-64-6-175-243.dfw.megapath.net
64.6.176.4	A	64-6-176-4.t1.sfo.megapath.net
64.6.176.16	A	64-6-176-16.t1.sfo.megapath.net
64.6.176.69	A	64-6-176-69.t1.sfo.megapath.net
64.6.176.74	A	64-6-176-74.t1.sfo.megapath.net
64.6.176.99	A	64-6-176-99.t1.sfo.megapath.net
64.6.176.161	A	64-6-176-161.t1.sfo.megapath.net
64.6.176.167	A	64-6-176-167.t1.sfo.megapath.net
64.6.176.210	A	imiga.org
64.6.176.214	A	64-6-176-214.t1.sfo.megapath.net
64.6.177.102	A	haleonwheels.org
64.6.177.161	PTR	64-6-176-161.t1.sfo.megapath.net
64.6.178.50	A	64-6-178-50.t1.sfo.megapath.net
64.6.178.50	A	mail-mp.nadcw.com
64.6.178.98	A+PTR	64-6-178-98.t1.sfo.megapath.net
64.6.178.98	A	ns3.networkveterans.com
64.6.178.158	A	mail.quailmountain.com
64.6.179.31	A	ns2.kingreef.com
64.6.179.31	A	*.kingreef.com
64.6.179.31	A	ns1.kingreef.com
64.6.180.76	A	ninechicago.com
64.6.182.34	PTR	64-6-182-34.t1.lax.megapath.net
64.6.182.34	A	moacfs.com
64.6.183.97	A	64-6-183-97.t1.lax.megapath.net
64.6.184.98	PTR	mail.dataexchangesystems.com
64.6.185.143	A	64-6-185-143.t1.orc.megapath.net
64.6.185.161	A+PTR	64-6-185-161.t1.orc.megapath.net
64.6.185.161	A	smtp-700l.boanerges.us
64.6.185.224	PTR	ns2.quikenet.com
64.6.185.225	PTR	ns.quikenet.com
64.6.185.247	A	mail.insulateici.com
64.6.185.247	A	smtp.insulateici.com
64.6.186.34	A+PTR	64-6-186-34.t1.nyc.megapath.net
64.6.186.89	A	64-6-186-89.t1.nyc.megapath.net
64.6.186.191	A	64-6-186-191.t1.nyc.megapath.net
64.6.187.24	A	64-6-187-24.t1.nyc.megapath.net
64.6.187.234	A	64-6-187-234.t1.nyc.megapath.net
64.6.187.235	A	64-6-187-235.t1.nyc.megapath.net
64.6.187.236	A	64-6-187-236.t1.nyc.megapath.net
64.6.187.237	A	64-6-187-237.t1.nyc.megapath.net
64.6.188.13	A	64-6-188-13.t1.njy.megapath.net
64.6.188.54	A	64-6-188-54.t1.njy.megapath.net
64.6.188.59	A	64-6-188-59.t1.njy.megapath.net
64.6.188.164	A	64-6-188-164.t1.njy.megapath.net
64.6.188.253	A	64-6-188-253.t1.njy.megapath.net
64.6.191.3	PTR	scott.xcity.com
64.6.191.4	PTR	mail.xcity.com