Robtex

Up: 65.90.80.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 65.90.80.0/22
Down right: 65.90.84.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
65.90.80.15	A	egix.net
65.90.80.15	A	www.egix.net
65.90.80.17	A	owa07.cbts.cinbell.com
65.90.80.18	PTR	mx2.cbts.cinbell.com
65.90.80.29	PTR	mx1.cbts.cinbell.com
65.90.80.217	PTR	mx1.cinbell.com
65.90.80.217	A+PTR	mx2.cbts.net
65.90.80.217	A+PTR	mx2.cbts.cinbell.com
65.90.80.237	A	mycbts.net
65.90.80.237	A	cbtsonline.com
65.90.80.237	A	www.cbts.cinbell.com
65.90.81.40	A	is.isoc.net
65.90.81.41	A	surgemail.isoc.net
65.90.81.42	A	web-nt1.isoc.net
65.90.81.43	A	web-nt2.isoc.net
65.90.81.51	A	inbound-mta-1.isoc.net
65.90.81.60	PTR	mail.isoc.net
65.90.81.60	A	mail.processpumpandseal.com
65.90.81.60	A	mail.murphycpafirm.com
65.90.81.70	A	modus.isoc.net
65.90.81.80	A+PTR	sql.isoc.net
65.90.81.85	A+PTR	sql2005.isoc.net
65.90.81.104	A	hiper3.isoc.net
65.90.81.120	A	server-1.isoc.net
65.90.81.200	A	power-switch-1.isoc.net
65.90.81.201	A	power-switch-2.isoc.net
65.90.81.202	A	power-switch-3.isoc.net
65.90.81.230	A	baystack.isoc.net
65.90.81.245	A	ns7.isoc.net
65.90.81.250	A+PTR	ns1.isoc.net
65.90.81.250	A	ns.iac.net
65.90.81.250	A	ns-1.isoc.net
65.90.81.251	A+PTR	ns2.isoc.net
65.90.81.254	PTR	root.isoc.net
65.90.83.22	PTR	ns2.emrsn.com
65.90.83.23	PTR	ns1.emrsn.com
65.90.83.73	A	getseerious.com
65.90.83.84	PTR	nam1.emrsn.net
65.90.83.111	A	emersonconnectivity.co.uk
65.90.83.235	A	insinkerater.com
65.90.83.235	A	www.instahot.com
65.90.84.162	A	mail.nor-comavsi.com
65.90.84.162	A	nor-comavsi.com
65.90.87.42	A	host-65-90-87-42.dsl.static.isoc.net
65.90.87.250	A	mx.qualifiedannuity.com