Robtex

Up: 66.85.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 66.85.80.0/23
Down right: 66.85.82.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.85.80.12	A+PTR	c-66-85-80-12.premium-chicago.nfoservers.com
66.85.80.65	A+PTR	c-66-85-80-65.premium-chicago.nfoservers.com
66.85.80.74	A+PTR	ego013.edge-gamers.com
66.85.80.102	A+PTR	02.chicago.il.us.node.dph.digitalpenquin.com
66.85.80.102	A	node.dph.digitalpenquin.com
66.85.80.115	PTR	c-66-85-80-115.premium-chicago.nfoservers.com
66.85.80.115	A	kitpvp.net
66.85.80.115	A	bathusmc.com
66.85.80.117	PTR	c-66-85-80-117.premium-chicago.nfoservers.com
66.85.80.117	A	minecraft.tv
66.85.80.117	A	crylin.co
66.85.80.118	PTR	xerodegrees
66.85.80.119	PTR	c-66-85-80-119.premium-chicago.nfoservers.com
66.85.80.121	A+PTR	c-66-85-80-121.premium-chicago.nfoservers.com
66.85.80.121	A	dieterbourassa.com
66.85.80.134	A	dedi.dreamek.com
66.85.80.145	A+PTR	v-66-85-80-145.unman-vds.premium-chicago.nfoservers.com
66.85.80.145	A	deliverance-hosting.com
66.85.80.163	A+PTR	v-66-85-80-163.unman-vds.premium-chicago.nfoservers.com
66.85.80.201	A+PTR	v-66-85-80-201.unman-vds.premium-chicago.nfoservers.com
66.85.80.210	A+PTR	c-66-85-80-210.premium-chicago.nfoservers.com
66.85.80.210	A	constructivetyranny.com
66.85.80.210	A	kevinclarkemusic.com
66.85.80.211	PTR	reach.republic.community
66.85.80.239	A	mail.tinkerbrooktradingco.com
66.85.80.239	A	mail.watyrbrook.com
66.85.80.239	A	mail.blainesbarbershop.com
66.85.80.241	PTR	diinomiites-nfo
66.85.80.251	PTR	v-66-85-80-251.unman-vds.premium-chicago.nfoservers.com
66.85.80.253	A+PTR	router.premium-chicago.nfoservers.com
66.85.80.255	A	broadcast.premium-chicago.nfoservers.com