Robtex

Up: 66.171.96.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.171.100.0/23
Down right: 66.171.102.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.171.100.16	PTR	c66-171-100-16.cablelan.net
66.171.100.23	PTR	c66-171-100-23.cablelan.net
66.171.100.27	PTR	c66-171-100-27.cablelan.net
66.171.100.28	PTR	c66-171-100-28.cablelan.net
66.171.100.38	A	mail.lslib.com
66.171.100.40	A+PTR	mail.quaaoutlodge.com
66.171.100.40	PTR	c66-171-100-40.cablelan.net
66.171.100.48	PTR	c66-171-100-48.cablelan.net
66.171.100.76	PTR	c66-171-100-76.cablelan.net
66.171.100.104	PTR	c66-171-100-104.cablelan.net
66.171.100.104	A	smtp2.kastein.com
66.171.100.104	A	smtp1.deuchar.ca
66.171.100.105	PTR	c66-171-100-105.cablelan.net
66.171.100.107	PTR	c66-171-100-107.cablelan.net
66.171.100.139	PTR	c66-171-100-139.cablelan.net
66.171.100.145	PTR	c66-171-100-145.cablelan.net
66.171.100.152	PTR	c66-171-100-152.cablelan.net
66.171.100.157	PTR	c66-171-100-157.cablelan.net
66.171.100.183	PTR	c66-171-100-183.cablelan.net
66.171.100.213	PTR	c66-171-100-213.cablelan.net
66.171.101.8	PTR	c66-171-101-8.cablelan.net
66.171.101.20	PTR	c66-171-101-20.cablelan.net
66.171.101.40	PTR	c66-171-101-40.cablelan.net
66.171.101.48	PTR	c66-171-101-48.cablelan.net
66.171.101.60	PTR	c66-171-101-60.cablelan.net
66.171.101.61	PTR	c66-171-101-61.cablelan.net
66.171.101.63	PTR	c66-171-101-63.cablelan.net
66.171.101.78	PTR	c66-171-101-78.cablelan.net
66.171.101.104	PTR	c66-171-101-104.cablelan.net
66.171.101.119	PTR	c66-171-101-119.cablelan.net
66.171.101.132	PTR	c66-171-101-132.cablelan.net
66.171.101.151	PTR	c66-171-101-151.cablelan.net
66.171.101.159	PTR	c66-171-101-159.cablelan.net
66.171.101.189	PTR	c66-171-101-189.cablelan.net
66.171.101.212	PTR	c66-171-101-212.cablelan.net
66.171.101.222	PTR	c66-171-101-222.cablelan.net
66.171.101.227	PTR	c66-171-101-227.cablelan.net
66.171.101.230	PTR	c66-171-101-230.cablelan.net
66.171.101.232	PTR	c66-171-101-232.cablelan.net
66.171.101.254	PTR	c66-171-101-254.cablelan.net
66.171.102.4	PTR	c66-171-102-4.cablelan.net
66.171.102.28	PTR	c66-171-102-28.cablelan.net
66.171.102.42	PTR	c66-171-102-42.cablelan.net
66.171.102.58	PTR	c66-171-102-58.cablelan.net
66.171.102.68	PTR	c66-171-102-68.cablelan.net
66.171.102.72	PTR	c66-171-102-72.cablelan.net
66.171.102.111	PTR	c66-171-102-111.cablelan.net
66.171.102.113	PTR	c66-171-102-113.cablelan.net
66.171.102.159	PTR	c66-171-102-159.cablelan.net
66.171.102.162	PTR	c66-171-102-162.cablelan.net
66.171.102.166	PTR	c66-171-102-166.cablelan.net
66.171.102.171	PTR	c66-171-102-171.cablelan.net
66.171.102.182	PTR	c66-171-102-182.cablelan.net
66.171.102.194	PTR	c66-171-102-194.cablelan.net
66.171.102.198	PTR	c66-171-102-198.cablelan.net
66.171.102.206	PTR	c66-171-102-206.cablelan.net
66.171.102.211	PTR	c66-171-102-211.cablelan.net
66.171.103.17	PTR	c66-171-103-17.cablelan.net
66.171.103.39	PTR	c66-171-103-39.cablelan.net
66.171.103.44	PTR	c66-171-103-44.cablelan.net
66.171.103.47	PTR	c66-171-103-47.cablelan.net
66.171.103.54	PTR	c66-171-103-54.cablelan.net
66.171.103.63	PTR	c66-171-103-63.cablelan.net
66.171.103.92	PTR	c66-171-103-92.cablelan.net
66.171.103.96	PTR	c66-171-103-96.cablelan.net
66.171.103.104	PTR	c66-171-103-104.cablelan.net
66.171.103.104	A	smtp2.kastein.com
66.171.103.104	A	smtp1.deuchar.ca
66.171.103.110	PTR	c66-171-103-110.cablelan.net
66.171.103.126	PTR	c66-171-103-126.cablelan.net
66.171.103.154	PTR	c66-171-103-154.cablelan.net
66.171.103.162	PTR	c66-171-103-162.cablelan.net
66.171.103.169	PTR	c66-171-103-169.cablelan.net
66.171.103.175	PTR	c66-171-103-175.cablelan.net
66.171.103.180	PTR	c66-171-103-180.cablelan.net
66.171.103.193	PTR	c66-171-103-193.cablelan.net
66.171.103.198	PTR	c66-171-103-198.cablelan.net
66.171.103.204	PTR	c66-171-103-204.cablelan.net
66.171.103.211	PTR	c66-171-103-211.cablelan.net
66.171.103.239	PTR	c66-171-103-239.cablelan.net
66.171.103.250	PTR	c66-171-103-250.cablelan.net