Robtex

Up: 208.56.4.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 208.56.4.0/25
Down right: 208.56.4.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.56.4.2	PTR	ppsc.nl
208.56.4.3	PTR	quadri.nl
208.56.4.7	PTR	tanco.nl
208.56.4.20	PTR	facusa.com.gt
208.56.4.24	PTR	208-56-4-24.navisite.net
208.56.4.39	PTR	wave-company.com
208.56.4.43	PTR	208-56-4-43.navisite.net
208.56.4.43	A	mail2.burimex.nl
208.56.4.43	A	securehost.nl
208.56.4.47	PTR	208-56-4-47.navisite.net
208.56.4.47	A	mail.razortag.com
208.56.4.47	A	razortag.com
208.56.4.55	PTR	aero-jet.com
208.56.4.57	PTR	blokhutgigant.nl
208.56.4.58	PTR	pro-light.nl
208.56.4.59	PTR	nrka.nl
208.56.4.64	PTR	neuron.gr
208.56.4.65	PTR	buysellnh.com
208.56.4.67	PTR	christianacademyofcarrollton.org
208.56.4.74	PTR	examplesasas.com
208.56.4.78	PTR	unassigned.alabanza.com
208.56.4.86	PTR	otbusa.org
208.56.4.86	A	mail.otbusa.org
208.56.4.93	A	tailsfromtheclips.ca
208.56.4.94	PTR	unassigned.alabanza.com
208.56.4.95	A	dsm531en1.qa.alabanza.com
208.56.4.97	A	vantest4.qa.alabanza.com
208.56.4.106	A	mail.alpasol.com.ar
208.56.4.109	PTR	unassigned.alabanza.com
208.56.4.109	A	roymaster.com.tw
208.56.4.117	A	mail.jamacuco.es
208.56.4.141	PTR	208-56-4-141.navisite.net
208.56.4.141	A	toupgrade1.qa.alabanza.com
208.56.4.142	PTR	208-56-4-142.navisite.net
208.56.4.142	A	toupgrade2.qa.alabanza.com
208.56.4.143	A	mail.toupgrade3.qa.alabanza.com
208.56.4.145	PTR	stateofshock.ca
208.56.4.148	PTR	it-consult.gr
208.56.4.152	A	info-educatie.nl
208.56.4.152	A	mail.info-educatie.nl
208.56.4.172	PTR	bancredit.com.gt
208.56.4.176	A	admin.mxlogic.alabanza.com
208.56.4.180	PTR	ns.siteaction.com
208.56.4.180	A	ns1.bethanylodge.net
208.56.4.185	PTR	gohpc.net
208.56.4.190	PTR	cvdga.org
208.56.4.191	PTR	oberjoyed.com
208.56.4.202	PTR	ns.siliconmountains.net
208.56.4.215	A	admin.advancednetworksystems.net
208.56.4.216	A	mail.rmnfgc.org
208.56.4.223	PTR	pesto.co.il
208.56.4.244	A+PTR	ns.crossingnet.com
208.56.4.244	A	mail.ns.crossingnet.com
208.56.4.247	PTR	unassigned.alabanza.com
208.56.4.250	PTR	208-56-4-250.navisite.net