Robtex

Up: 64.81.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 64.81.20.0/23
Down right: 64.81.22.0/23

IP	Type	Hostname
64.81.20.35	A	mx01.bookbargainsonline.com
64.81.20.71	PTR	webmail.mfaca.sva.edu
64.81.21.80	A+PTR	dsl081-021-080.nyc1.dsl.speakeasy.net
64.81.21.80	A	usacs.info
64.81.21.80	A	www.usadealerweb.com
64.81.21.85	PTR	dsl081-021-085.nyc1.dsl.speakeasy.net
64.81.21.85	A	usacs.net
64.81.21.86	PTR	dsl081-021-086.nyc1.dsl.speakeasy.net
64.81.21.86	A	spamfilter.usacs.net
64.81.21.210	A	dsl081-021-210.nyc1.dsl.speakeasy.net
64.81.22.3	PTR	mail.bccadd.org
64.81.22.83	PTR	dsl081-022-083.phl1.dsl.speakeasy.net
64.81.22.172	A	dsl081-022-172.phl1.dsl.speakeasy.net
64.81.22.182	A	dsl081-022-182.phl1.dsl.speakeasy.net
64.81.22.222	A	phillytechno.org
64.81.22.252	A	dsl081-022-252.phl1.dsl.speakeasy.net
64.81.23.0	A+PTR	dsl081-023-000.nyc1.dsl.speakeasy.net
64.81.23.5	PTR	dsl081-023-005.nyc1.dsl.speakeasy.net
64.81.23.5	A	tollgroup.us
64.81.23.13	A+PTR	dsl081-023-013.nyc1.dsl.speakeasy.net
64.81.23.15	A+PTR	dsl081-023-015.nyc1.dsl.speakeasy.net
64.81.23.24	A+PTR	dsl081-023-024.nyc1.dsl.speakeasy.net
64.81.23.32	A+PTR	dsl081-023-032.nyc1.dsl.speakeasy.net
64.81.23.34	A+PTR	dsl081-023-034.nyc1.dsl.speakeasy.net
64.81.23.54	A+PTR	dsl081-023-054.nyc1.dsl.speakeasy.net
64.81.23.66	A+PTR	mail.eti-nj.com
64.81.23.66	A	public.eti-nj.com
64.81.23.67	A+PTR	dsl081-023-067.nyc1.dsl.speakeasy.net
64.81.23.68	PTR	mail1.richards-mfg.com
64.81.23.72	A+PTR	dsl081-023-072.nyc1.dsl.speakeasy.net
64.81.23.73	A+PTR	dsl081-023-073.nyc1.dsl.speakeasy.net
64.81.23.82	A+PTR	dsl081-023-082.nyc1.dsl.speakeasy.net
64.81.23.88	A+PTR	dsl081-023-088.nyc1.dsl.speakeasy.net
64.81.23.89	A+PTR	dsl081-023-089.nyc1.dsl.speakeasy.net
64.81.23.90	A+PTR	dsl081-023-090.nyc1.dsl.speakeasy.net
64.81.23.95	A+PTR	dsl081-023-095.nyc1.dsl.speakeasy.net
64.81.23.97	A+PTR	dsl081-023-097.nyc1.dsl.speakeasy.net
64.81.23.117	A+PTR	dsl081-023-117.nyc1.dsl.speakeasy.net
64.81.23.125	A+PTR	dsl081-023-125.nyc1.dsl.speakeasy.net
64.81.23.128	A+PTR	dsl081-023-128.nyc1.dsl.speakeasy.net
64.81.23.129	A+PTR	dsl081-023-129.nyc1.dsl.speakeasy.net
64.81.23.130	A+PTR	dsl081-023-130.nyc1.dsl.speakeasy.net
64.81.23.134	A+PTR	dsl081-023-134.nyc1.dsl.speakeasy.net
64.81.23.137	A+PTR	dsl081-023-137.nyc1.dsl.speakeasy.net
64.81.23.143	A+PTR	dsl081-023-143.nyc1.dsl.speakeasy.net
64.81.23.145	A+PTR	dsl081-023-145.nyc1.dsl.speakeasy.net
64.81.23.171	A+PTR	dsl081-023-171.nyc1.dsl.speakeasy.net
64.81.23.176	A+PTR	dsl081-023-176.nyc1.dsl.speakeasy.net
64.81.23.177	A+PTR	dsl081-023-177.nyc1.dsl.speakeasy.net
64.81.23.181	A+PTR	dsl081-023-181.nyc1.dsl.speakeasy.net
64.81.23.187	A+PTR	dsl081-023-187.nyc1.dsl.speakeasy.net
64.81.23.201	A+PTR	dsl081-023-201.nyc1.dsl.speakeasy.net
64.81.23.210	A+PTR	dsl081-023-210.nyc1.dsl.speakeasy.net
64.81.23.214	A+PTR	dsl081-023-214.nyc1.dsl.speakeasy.net
64.81.23.217	A+PTR	dsl081-023-217.nyc1.dsl.speakeasy.net
64.81.23.227	PTR	mail.pressler-pressler.com
64.81.23.233	A+PTR	dsl081-023-233.nyc1.dsl.speakeasy.net
64.81.23.239	A+PTR	dsl081-023-239.nyc1.dsl.speakeasy.net
64.81.23.244	A+PTR	dsl081-023-244.nyc1.dsl.speakeasy.net
64.81.23.245	A+PTR	dsl081-023-245.nyc1.dsl.speakeasy.net
64.81.23.246	A+PTR	dsl081-023-246.nyc1.dsl.speakeasy.net
64.81.23.251	A+PTR	dsl081-023-251.nyc1.dsl.speakeasy.net
64.81.23.253	A+PTR	dsl081-023-253.nyc1.dsl.speakeasy.net