Robtex

Up: 66.79.0.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.79.4.0/23
Down right: 66.79.6.0/23

IP	Type	Hostname
66.79.4.13	PTR	66-79-4-13.madisonriver.net
66.79.4.81	PTR	66-79-4-81.madisonriver.net
66.79.4.82	PTR	66-79-4-82.madisonriver.net
66.79.4.123	PTR	66-79-4-123.madisonriver.net
66.79.4.137	PTR	66-79-4-137.madisonriver.net
66.79.4.193	PTR	66-79-4-193.madisonriver.net
66.79.4.213	PTR	66-79-4-213.madisonriver.net
66.79.4.234	PTR	66-79-4-234.madisonriver.net
66.79.4.236	PTR	66-79-4-236.madisonriver.net
66.79.4.247	PTR	66-79-4-247.madisonriver.net
66.79.5.6	PTR	peknil-host-ci7505-01.grics.net
66.79.5.7	A+PTR	66-79-5-7.clec.atlnga.commercial.madisonriver.net
66.79.5.8	PTR	66-79-5-8.clec.atlnga.commercial.madisonriver.net
66.79.5.19	PTR	66-79-5-19.clec.atlnga.commercial.madisonriver.net
66.79.5.32	PTR	66-79-5-32.clec.atlnga.commercial.madisonriver.net
66.79.5.43	PTR	66-79-5-43.clec.atlnga.commercial.madisonriver.net
66.79.5.53	PTR	atlnga-host-jum160-01.madisonriver.net
66.79.5.56	PTR	66-79-5-56.clec.atlnga.commercial.madisonriver.net
66.79.5.57	PTR	atlnga-host-jum160-01.madisonriver.net
66.79.5.75	PTR	66-79-5-75.clec.atlnga.commercial.madisonriver.net
66.79.5.76	PTR	66-79-5-76.clec.atlnga.commercial.madisonriver.net
66.79.5.84	A	dsgplnkaslfvxy.net
66.79.5.92	PTR	66-79-5-92.clec.atlnga.commercial.madisonriver.net
66.79.5.94	PTR	66-79-5-94.clec.atlnga.commercial.madisonriver.net
66.79.5.105	A+PTR	66-79-5-105.clec.atlnga.commercial.madisonriver.net
66.79.5.128	PTR	66-79-5-128.clec.atlnga.commercial.madisonriver.net
66.79.5.157	PTR	66-79-5-157.clec.atlnga.commercial.madisonriver.net
66.79.5.250	PTR	66-79-5-250.clec.atlnga.commercial.madisonriver.net
66.79.6.1	PTR	66-79-6-1.stat.gulftel.net
66.79.6.5	PTR	66-79-6-5.stat.gulftel.net
66.79.6.15	PTR	66-79-6-15.stat.gulftel.net
66.79.6.18	PTR	66-79-6-18.stat.gulftel.net
66.79.6.26	PTR	66-79-6-26.stat.gulftel.net
66.79.6.30	PTR	66-79-6-30.stat.gulftel.net
66.79.6.43	A	mail.rcelaw.com
66.79.6.43	A	rcelaw.com
66.79.6.45	PTR	66-79-6-45.stat.gulftel.net
66.79.6.47	PTR	66-79-6-47.stat.gulftel.net
66.79.6.60	PTR	66-79-6-60.stat.gulftel.net
66.79.6.70	PTR	66-79-6-70.stat.gulftel.net
66.79.6.71	PTR	66-79-6-71.stat.gulftel.net
66.79.6.76	A	mail.clarkandsands.com
66.79.6.77	PTR	66-79-6-77.stat.gulftel.net
66.79.6.78	PTR	66-79-6-78.stat.gulftel.net
66.79.6.82	PTR	66-79-6-82.stat.gulftel.net
66.79.6.107	PTR	66-79-6-107.stat.gulftel.net
66.79.6.238	PTR	66-79-6-238.stat.gulftel.net
66.79.7.1	A+PTR	66-79-7-1.clec.nworla.commercial.madisonriver.net
66.79.7.4	PTR	66-79-7-4.clec.nworla.commercial.madisonriver.net
66.79.7.16	PTR	66-79-7-16.clec.nworla.commercial.madisonriver.net
66.79.7.19	PTR	66-79-7-19.clec.nworla.commercial.madisonriver.net
66.79.7.56	PTR	66-79-7-56.clec.nworla.commercial.madisonriver.net
66.79.7.65	PTR	66-79-7-65.clec.nworla.commercial.madisonriver.net
66.79.7.163	PTR	66-79-7-163.clec.nworla.commercial.madisonriver.net
66.79.7.164	PTR	66-79-7-164.clec.nworla.commercial.madisonriver.net
66.79.7.200	PTR	66-79-7-200.clec.nworla.commercial.madisonriver.net