Robtex

Up: 64.251.80.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 64.251.88.0/22
Down right: 64.251.92.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
64.251.92.57	PTR	h64-251-92-57.bigpipeinc.com
64.251.92.98	PTR	h64-251-92-98.bigpipeinc.com
64.251.92.235	PTR	h64-251-92-235.bigpipeinc.com
64.251.93.131	PTR	mail.wispernet.ca
64.251.93.131	A	www.wispernet.ca
64.251.93.131	A	wispernet.ca
64.251.94.10	A	wispernet.blackswanhelicopters.com
64.251.95.2	A	mail.northernsunrise.net
64.251.95.3	PTR	h64-251-95-3.bigpipeinc.com
64.251.95.11	PTR	h64-251-95-11.bigpipeinc.com
64.251.95.16	PTR	h64-251-95-16.bigpipeinc.com
64.251.95.18	PTR	h64-251-95-18.bigpipeinc.com
64.251.95.19	PTR	h64-251-95-19.bigpipeinc.com
64.251.95.32	PTR	h64-251-95-32.bigpipeinc.com
64.251.95.48	PTR	h64-251-95-48.bigpipeinc.com
64.251.95.51	PTR	h64-251-95-51.bigpipeinc.com
64.251.95.58	PTR	h64-251-95-58.bigpipeinc.com
64.251.95.59	PTR	h64-251-95-59.bigpipeinc.com
64.251.95.64	PTR	h64-251-95-64.bigpipeinc.com
64.251.95.66	PTR	h64-251-95-66.bigpipeinc.com
64.251.95.67	PTR	h64-251-95-67.bigpipeinc.com
64.251.95.82	PTR	h64-251-95-82.bigpipeinc.com
64.251.95.83	PTR	h64-251-95-83.bigpipeinc.com
64.251.95.90	PTR	h64-251-95-90.bigpipeinc.com
64.251.95.91	PTR	h64-251-95-91.bigpipeinc.com
64.251.95.96	PTR	h64-251-95-96.bigpipeinc.com
64.251.95.97	PTR	h64-251-95-97.bigpipeinc.com
64.251.95.112	PTR	h64-251-95-112.bigpipeinc.com
64.251.95.115	PTR	h64-251-95-115.bigpipeinc.com
64.251.95.129	PTR	h64-251-95-129.bigpipeinc.com
64.251.95.130	PTR	h64-251-95-130.bigpipeinc.com
64.251.95.137	PTR	h64-251-95-137.bigpipeinc.com
64.251.95.138	PTR	h64-251-95-138.bigpipeinc.com
64.251.95.153	PTR	h64-251-95-153.bigpipeinc.com
64.251.95.161	PTR	h64-251-95-161.bigpipeinc.com
64.251.95.184	PTR	h64-251-95-184.bigpipeinc.com
64.251.95.193	PTR	h64-251-95-193.bigpipeinc.com
64.251.95.196	PTR	h64-251-95-196.bigpipeinc.com
64.251.95.224	PTR	h64-251-95-224.bigpipeinc.com
64.251.95.233	PTR	h64-251-95-233.bigpipeinc.com
64.251.95.234	PTR	h64-251-95-234.bigpipeinc.com
64.251.95.240	PTR	h64-251-95-240.bigpipeinc.com
64.251.95.249	PTR	h64-251-95-249.bigpipeinc.com
64.251.95.250	PTR	h64-251-95-250.bigpipeinc.com