Robtex

Up: 72.51.8.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 72.51.12.0/23
Down right: 72.51.14.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.51.12.8	A+PTR	kvm.conflux.net
72.51.12.10	A+PTR	ns1.conflux.net
72.51.12.11	PTR	mail.conflux.net
72.51.12.12	A+PTR	ns2.conflux.net
72.51.12.16	A+PTR	tonkinese.conflux.net
72.51.12.17	A	abyssinian.conflux.net
72.51.12.19	A	ragdoll.conflux.net
72.51.12.20	PTR	birman.conflux.net
72.51.12.21	A+PTR	nebelung.conflux.net
72.51.12.32	A	www.cryptocybernetics.com
72.51.12.33	A	server.cryptocybernetics.com
72.51.12.34	A	secure.cryptocybernetics.com
72.51.12.35	A+PTR	projects.cryptocybernetics.com
72.51.12.36	A	email.cryptocybernetics.com
72.51.12.37	A+PTR	stage.cryptocybernetics.com
72.51.12.38	A	cryptocybernetics.com
72.51.12.42	PTR	painter.org
72.51.12.42	A	mail.painter.org
72.51.12.44	PTR	xsides.com
72.51.12.58	PTR	acorndynamics.com
72.51.12.70	PTR	nason.net
72.51.12.71	PTR	mail.nason.net
72.51.12.79	PTR	grayareatech.com
72.51.12.90	PTR	knotpad.com
72.51.12.95	A+PTR	conflux.net
72.51.12.95	A	www.conflux.net
72.51.12.95	A	mail.conflux.net
72.51.12.97	PTR	conflux.com
72.51.12.98	A+PTR	tjp.conflux.net
72.51.12.99	A	park.conflux.net
72.51.12.102	PTR	septalus.com
72.51.12.110	A+PTR	switchbox.com
72.51.12.110	A	darkstone.com
72.51.12.110	A	darkstone.info
72.51.12.112	A+PTR	tchou.com
72.51.12.114	A+PTR	vpix.com
72.51.12.114	A	www.vpix.com
72.51.12.144	PTR	p17.org
72.51.12.146	A	cdn.p17.org
72.51.12.147	PTR	dns.p17.org
72.51.12.153	A	mail.p17.org
72.51.12.153	A	mail.pavelt.com
72.51.12.156	PTR	treskunov.org
72.51.13.10	PTR	dns.winkwinknodnod.net
72.51.13.22	PTR	hoosier.winkwinknodnod.net
72.51.14.11	PTR	mail.bollingerbands.net
72.51.14.29	PTR	hellcat.bollingerbands.net
72.51.14.30	PTR	warthog.bollingerbands.net
72.51.14.83	PTR	www3.grouppower.com
72.51.14.86	PTR	db2.grouppower.com
72.51.14.95	PTR	db1.markettechnician.com
72.51.14.104	PTR	stage.patternpower.com
72.51.14.117	PTR	app1.acmeanalytics.com
72.51.14.201	PTR	stage.basket-trader.com
72.51.14.228	PTR	www.poweranalytics.com
72.51.14.232	PTR	www.mtaef.net