Robtex

Up: 66.17.80.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 66.17.80.0/22
Down right: 66.17.84.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.17.80.0	PTR	66-17-80-0.unsi.net
66.17.80.42	PTR	66-17-80-42.unsi.net
66.17.81.2	PTR	66-17-81-2.unsi.net
66.17.82.55	A	sdllabs.org
66.17.82.55	A	www.sdllabs.org
66.17.82.55	A	mail.sdllabs.org
66.17.82.80	PTR	mail.edkey.org
66.17.82.254	A	sequoia.edkey.org
66.17.82.254	A	www.sequoia.net
66.17.82.254	A	gnoshing.com
66.17.83.110	A	server.stormwind.com
66.17.84.243	PTR	66-17-84-243-moremazda.bwg.phx.unsi.net
66.17.84.250	A	mail.aesphoenix.com
66.17.84.251	PTR	bcast-arizonaelectricsupply.atr.phx.unsi.net
66.17.85.37	A	mail.premiumpostcard.com
66.17.85.37	A	mail.integrato.com
66.17.85.114	A	mail.duiguys.com
66.17.85.115	PTR	66-17-85-115-unused.phx.unsi.net
66.17.85.115	A	gtmbsite.com
66.17.85.115	A	*.gtmbsite.com
66.17.85.186	PTR	mail.azconference.org
66.17.86.42	A+PTR	remote.fbsaz.com
66.17.86.42	A	mail.fbsinc.biz
66.17.86.118	A	mail.facilitecinc.com
66.17.86.126	A	idgfoodservice.com
66.17.86.195	PTR	66-17-86-195-securemedical.map.phx.unsi.net
66.17.86.195	A	pharmacyreview.net
66.17.86.195	A	pharmacyreview.org
66.17.86.201	PTR	66-17-86-201-securemedical.map.phx.unsi.net
66.17.86.201	A	lcppharmacy.com
66.17.86.202	A	66-17-86-202-securemedical.map.phx.sparkplugbb.net
66.17.86.211	PTR	66-17-86-211-securemedical.map.phx.unsi.net
66.17.86.211	A	www.stimula-us.com
66.17.86.211	A	stimula-us.com
66.17.86.219	PTR	barracuda.securemedical.com
66.17.86.219	A	barracuda.medfico.com
66.17.86.219	A	spamfilter.accessrx.com
66.17.86.220	A	mail.edrugstore.md
66.17.86.232	A	es.edrugstore.md
66.17.86.241	PTR	mail.securemedical.com
66.17.86.253	A	steveforever.com
66.17.86.253	A	steve4ever.com
66.17.87.137	PTR	ps.pageud.k12.az.us
66.17.87.211	PTR	66-17-87-211-dillonaero.wkr.phx.unsi.net
66.17.87.211	A	smtp1.dillonaero.com