Robtex

Up: 64.50.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 64.50.128.0/20
Down right: 64.50.144.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.50.128.0	PTR	64-50-128-0.client.dsl.net
64.50.128.34	A	mail.roseguggenheimer.com
64.50.128.165	A	64-50-128-165.client.dsl.net
64.50.128.250	A	64-50-128-250.client.dsl.net
64.50.130.6	A+PTR	64-50-130-6.client.dsl.net
64.50.131.11	A	64-50-131-11.client.dsl.net
64.50.131.22	A	64-50-131-22.client.dsl.net
64.50.131.26	A	64-50-131-26.client.dsl.net
64.50.131.28	A	64-50-131-28.client.dsl.net
64.50.131.33	A+PTR	64-50-131-33.client.dsl.net
64.50.131.34	A+PTR	64-50-131-34.client.dsl.net
64.50.131.39	A	64-50-131-39.client.dsl.net
64.50.131.41	A	64-50-131-41.client.dsl.net
64.50.131.66	A+PTR	64-50-131-66.client.dsl.net
64.50.131.68	A	64-50-131-68.client.dsl.net
64.50.131.70	A	64-50-131-70.client.dsl.net
64.50.131.72	A	64-50-131-72.client.dsl.net
64.50.131.98	A+PTR	64-50-131-98.client.dsl.net
64.50.131.101	A	64-50-131-101.client.dsl.net
64.50.131.106	A	64-50-131-106.client.dsl.net
64.50.131.109	A	64-50-131-109.client.dsl.net
64.50.131.130	A+PTR	64-50-131-130.client.dsl.net
64.50.131.137	A	64-50-131-137.client.dsl.net
64.50.131.138	A	64-50-131-138.client.dsl.net
64.50.131.140	A	64-50-131-140.client.dsl.net
64.50.131.168	A	64-50-131-168.client.dsl.net
64.50.131.169	A	64-50-131-169.client.dsl.net
64.50.131.183	A	64-50-131-183.client.dsl.net
64.50.131.184	A	64-50-131-184.client.dsl.net
64.50.131.194	PTR	64-50-131-194.client.dsl.net
64.50.131.196	A	64-50-131-196.client.dsl.net
64.50.131.198	A	64-50-131-198.client.dsl.net
64.50.131.201	A	64-50-131-201.client.dsl.net
64.50.131.203	A	64-50-131-203.client.dsl.net
64.50.131.225	A+PTR	64-50-131-225.client.dsl.net
64.50.131.232	A	64-50-131-232.client.dsl.net
64.50.131.234	A	64-50-131-234.client.dsl.net
64.50.131.240	A	64-50-131-240.client.dsl.net
64.50.135.162	A	64-50-135-162.client.dsl.net
64.50.137.10	A+PTR	64-50-137-10.client.dsl.net
64.50.137.180	A+PTR	64-50-137-180.client.dsl.net
64.50.141.1	A+PTR	64-50-141-1.client.dsl.net
64.50.141.3	A+PTR	64-50-141-3.client.dsl.net
64.50.141.5	A	64-50-141-5.client.dsl.net
64.50.141.7	A	64-50-141-7.client.dsl.net
64.50.141.38	A	64-50-141-38.client.dsl.net
64.50.141.40	A	64-50-141-40.client.dsl.net
64.50.141.42	A	64-50-141-42.client.dsl.net
64.50.141.43	A	64-50-141-43.client.dsl.net
64.50.141.64	A+PTR	64-50-141-64.client.dsl.net
64.50.141.76	A	64-50-141-76.client.dsl.net
64.50.141.85	A	64-50-141-85.client.dsl.net
64.50.141.89	A	64-50-141-89.client.dsl.net
64.50.141.100	A	64-50-141-100.client.dsl.net
64.50.141.105	A	64-50-141-105.client.dsl.net
64.50.141.113	A	64-50-141-113.client.dsl.net
64.50.141.114	A	64-50-141-114.client.dsl.net
64.50.141.139	A	64-50-141-139.client.dsl.net
64.50.141.140	A	64-50-141-140.client.dsl.net
64.50.141.148	A	64-50-141-148.client.dsl.net
64.50.141.149	A	64-50-141-149.client.dsl.net
64.50.141.168	A	64-50-141-168.client.dsl.net
64.50.141.170	A	64-50-141-170.client.dsl.net
64.50.141.175	A	64-50-141-175.client.dsl.net
64.50.141.184	A	64-50-141-184.client.dsl.net
64.50.141.202	A	64-50-141-202.client.dsl.net
64.50.141.204	A	64-50-141-204.client.dsl.net
64.50.141.207	A	64-50-141-207.client.dsl.net
64.50.141.208	A	64-50-141-208.client.dsl.net
64.50.141.225	A+PTR	64-50-141-225.client.dsl.net
64.50.141.226	A+PTR	64-50-141-226.client.dsl.net
64.50.141.240	A	64-50-141-240.client.dsl.net
64.50.141.245	A	64-50-141-245.client.dsl.net
64.50.143.255	A	64-50-143-255.client.dsl.net
64.50.144.6	A	ba6.scsend.net
64.50.144.8	A	app.mailworkz.com
64.50.144.8	A	ezlistz.com
64.50.144.8	A	simplycast.net
64.50.144.50	A	bounce.emailos.com
64.50.144.50	A	bounce.marketinggalaxy.com
64.50.145.2	A	sa2.scsend.com
64.50.145.6	A	sa6.scsend.com
64.50.145.10	A	sa10.scsend.com
64.50.145.19	A	mail1.marketing.eastlink.ca
64.50.145.32	A+PTR	sa32.scsend.com
64.50.145.43	A	sa43.scsend.com
64.50.145.44	A	newsletter.longisland.com
64.50.145.48	A	sa48.scsend.com
64.50.145.64	A	sa64.scsend.com
64.50.145.70	A	sa70.scsend.com
64.50.145.73	A	sa73.scsend.com
64.50.145.76	A	sa76.scsend.com
64.50.145.97	A+PTR	sa97.scsend.com
64.50.145.105	A	sa105.scsend.com
64.50.145.107	A	sa107.scsend.com
64.50.145.110	A	sa110.scsend.com
64.50.145.138	A	sa138.scsend.com
64.50.145.140	A	sa140.scsend.com
64.50.145.154	A	sa154.scsend.com
64.50.145.155	A	sa155.scsend.com
64.50.145.160	A+PTR	sa160.scsend.com
64.50.145.223	A	sa223.scsend.com
64.50.146.1	PTR	scmc002.net
64.50.146.1	A	regopolis.com
64.50.146.48	A	64-50-146-48.client.dsl.net
64.50.146.50	A	ga50.scsend.net
64.50.146.70	A	ga70.scsend.net
64.50.146.243	A	ga243.scsend.net
64.50.146.247	A	ga247.scsend.net
64.50.148.6	A	sb6.scsend.net
64.50.148.110	A	maila.marketinggalaxy.com
64.50.148.174	A	sb174.scsend.net
64.50.148.208	A	sb208.scsend.net
64.50.149.1	A+PTR	bb1.scsend.net
64.50.149.2	A+PTR	bb2.scsend.net
64.50.149.5	A	bb5.scsend.net
64.50.149.7	A	bb7.scsend.net
64.50.149.35	A	bb35.scsend.net
64.50.149.40	A	bb40.scsend.net
64.50.149.46	A	bb46.scsend.net
64.50.149.81	A	bb81.scsend.net
64.50.149.100	A	bb100.scsend.net
64.50.149.177	A	bb177.scsend.net
64.50.149.187	A	bb187.scsend.net
64.50.149.210	A	bb210.scsend.net
64.50.150.6	A	ha6.scsend.net
64.50.150.13	A	ha13.scsend.net
64.50.150.29	A	ha29.scsend.net
64.50.150.41	A	ha41.scsend.net
64.50.150.125	A	ha125.scsend.net
64.50.150.137	A	ha137.scsend.net
64.50.150.142	A	ha142.scsend.net
64.50.150.159	A	ha159.scsend.net
64.50.150.167	A	ha167.scsend.net
64.50.150.188	A	ha188.scsend.net
64.50.150.190	A	ha190.scsend.net
64.50.150.224	A	ha224.scsend.net
64.50.150.248	A	ha248.scsend.net
64.50.150.250	A	ha250.scsend.net
64.50.151.2	A+PTR	hb2.emailos.com
64.50.151.3	A	hb3.emailos.com
64.50.151.5	A	hb5.emailos.com
64.50.151.11	A	hb11.emailos.com
64.50.151.34	A	hb34.emailos.com
64.50.151.35	A	hb35.emailos.com
64.50.151.36	A	hb36.emailos.com
64.50.151.40	A	hb40.emailos.com
64.50.151.67	A+PTR	hb67.emailos.com
64.50.151.77	A	hb77.emailos.com
64.50.151.78	A	hb78.emailos.com
64.50.151.87	A	hb87.emailos.com
64.50.151.97	A	hb97.emailos.com
64.50.151.99	A	hb99.emailos.com
64.50.151.101	A	hb101.emailos.com
64.50.151.102	A	hb102.emailos.com
64.50.151.129	A	hb129.emailos.com
64.50.151.140	A	hb140.emailos.com
64.50.151.144	A	hb144.emailos.com
64.50.151.151	A	hb151.emailos.com
64.50.151.164	A	hb164.emailos.com
64.50.151.167	A	hb167.emailos.com
64.50.151.175	A	hb175.emailos.com
64.50.151.176	A	hb176.emailos.com
64.50.151.192	A	hb192.emailos.com
64.50.151.193	A	hb193.emailos.com
64.50.151.194	A+PTR	hb194.emailos.com
64.50.151.195	A	hb195.emailos.com
64.50.151.225	A	hb225.emailos.com
64.50.151.229	A	hb229.emailos.com
64.50.151.232	A	hb232.emailos.com
64.50.151.235	A	hb235.emailos.com
64.50.152.24	A	transactional.emailboster.com
64.50.152.134	A+PTR	mailer4.marketer365.com
64.50.152.183	A+PTR	mailer1.yillou.net
64.50.153.249	A	64-50-153-249.client.dsl.net
64.50.155.4	A	zebratrackz.com
64.50.155.4	A	simplycast.mobi
64.50.155.4	A	marketinggalaxy.com
64.50.155.28	PTR	ns2.scsend.net
64.50.155.29	PTR	ns1.scsend.net
64.50.155.32	PTR	app5.simplycast.com
64.50.155.33	A+PTR	app6.simplycast.com
64.50.155.50	A	social-mailer.com
64.50.155.50	A	crm-optin.com
64.50.155.50	A	crmoptinmailer.com
64.50.155.125	A	64-50-155-125.client.dsl.net
64.50.155.158	PTR	app.scsend.net
64.50.156.2	A+PTR	na2.scsend.net
64.50.156.16	A	na16.scsend.net
64.50.156.26	A	na26.scsend.net
64.50.156.36	A	na36.scsend.net
64.50.156.39	A	na39.scsend.net
64.50.156.54	A	na54.scsend.net
64.50.156.66	A+PTR	na66.scsend.net
64.50.156.77	A	na77.scsend.net
64.50.156.91	A	na91.scsend.net
64.50.156.93	A	na93.scsend.net
64.50.156.97	A+PTR	na97.scsend.net
64.50.156.102	A	na102.scsend.net
64.50.156.114	A	na114.scsend.net
64.50.156.116	A	na116.scsend.net
64.50.156.134	A	na134.scsend.net
64.50.156.142	A	na142.scsend.net
64.50.156.144	A	na144.scsend.net
64.50.156.146	A	na146.scsend.net
64.50.156.163	A+PTR	na163.scsend.net
64.50.156.167	A	na167.scsend.net
64.50.156.168	A	na168.scsend.net
64.50.156.179	A	na179.scsend.net
64.50.156.192	A+PTR	na192.scsend.net
64.50.156.193	A+PTR	na193.scsend.net
64.50.156.194	A+PTR	na194.scsend.net
64.50.156.196	A	na196.scsend.net
64.50.156.228	A	na228.scsend.net
64.50.156.250	A	na250.scsend.net
64.50.157.152	A	nb152.scsend.net
64.50.157.193	A	nb193.scsend.net
64.50.158.116	A	nc116.scsend.net
64.50.159.23	A	nd23.scsend.net
64.50.159.99	A	nd99.scsend.net