Robtex

Up: 208.72.80.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 208.72.84.0/23
Down right: 208.72.86.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
208.72.84.0	PTR	net84.net.cluetrust.net
208.72.84.0	PTR	reserved-0.84.72.208.in-addr.arpa
208.72.84.4	PTR	reserved-4.84.72.208.in-addr.arpa
208.72.84.7	PTR	ice.cryptonetwork.com
208.72.84.7	A	ooda.us
208.72.84.7	A	wintermutelabs.com
208.72.84.23	PTR	auto.ar.com
208.72.84.24	A+PTR	wc.bogons.net
208.72.84.24	A	ns1.bogons.net
208.72.84.25	PTR	black-arts.org
208.72.84.26	PTR	2a.vcdl.org
208.72.84.27	A+PTR	ra.iago.org
208.72.84.27	A	iago.org
208.72.84.31	A	prime.akisu.com
208.72.84.32	PTR	librum.org
208.72.84.34	PTR	root.org
208.72.84.37	A+PTR	iad2.alfar.com
208.72.84.37	PTR	ns.alfar.com
208.72.84.37	A	www.alfar.com
208.72.84.38	PTR	ns2-iad.loligo.com
208.72.84.40	PTR	eek.dmumford.com
208.72.84.40	A	thegoodrumfamily.com
208.72.84.40	A	ns1.dmumford.com
208.72.84.55	A	fw.netcraftsmen.net
208.72.84.56	A	ns1.netcraftsmen.net
208.72.84.57	A	mail.netcraftsmen.net
208.72.84.58	A	future-use.netcraftsmen.net
208.72.84.59	A	cn1.netcraftsmen.net
208.72.84.60	A	apc.netcraftsmen.net
208.72.84.84	A	ns1.dmumford.com
208.72.84.84	A	dmumford.com
208.72.84.84	A	mail.dmumford.com
208.72.84.100	PTR	librum.org
208.72.84.100	A	a.ns.ai5c.com
208.72.84.100	A	eisenbergs.org
208.72.84.104	A	chrx.org
208.72.84.106	A	ns.root.org
208.72.84.106	A	www.rootlabs.com
208.72.84.106	A	mail.rootlabs.com
208.72.84.116	A	ns1.uraeus.com
208.72.84.117	A+PTR	neoshoggoth.uraeus.com
208.72.84.117	A	mail-relay.uraeus.com
208.72.84.118	A+PTR	ns1.uraeus.com
208.72.84.122	A	www.uraeus.com
208.72.84.122	A	malcolm.com
208.72.84.127	A	leng.uraeus.com
208.72.84.139	A	www.iago.org
208.72.84.139	A	staticweb.iago.org
208.72.84.150	PTR	mail.logixedge.com
208.72.84.150	A	mail.iad01.logixedge.com
208.72.84.164	PTR	w2.hweb.cluetrust.net
208.72.84.164	A	scavengerwalk.com
208.72.84.164	A	criminalbehavior.net
208.72.84.196	A+PTR	punctilious.kempt.net
208.72.84.197	A	ajax.kempt.net
208.72.84.198	A+PTR	iago.kempt.net
208.72.84.201	PTR	faste-0-0-199.makita.seastrom.com
208.72.84.201	A	mixbury.kempt.net
208.72.84.202	A+PTR	haku.kempt.net
208.72.84.202	A	ns.kempt.net
208.72.84.203	A+PTR	catbus.kempt.net
208.72.84.205	A	karinaskyeadams.com
208.72.84.205	A	phy6.org
208.72.84.205	A	www.kempt.net
208.72.84.212	A+PTR	freya.alfar.com
208.72.84.212	A	www2.alfar.com
208.72.84.212	A	ns.alfar.com
208.72.84.220	PTR	blackops.sackheads.org
208.72.84.220	A	donelan.com
208.72.84.220	A	www.donelan.com
208.72.84.226	PTR	imladris.alfar.com
208.72.84.229	PTR	air.alfar.com
208.72.85.18	A	mail.joss.com
208.72.85.53	PTR	xilet5.com
208.72.85.54	A	evergreen-54.cluetrust.net
208.72.85.73	A	dyn73.sterling.cluetrust.net
208.72.85.251	PTR	reserved-251.85.72.208.in-addr.arpa
208.72.85.251	A	makita.cluetrust.net
208.72.86.21	A	lab-21.ash.cluetrust.net
208.72.86.25	A	lab-25.ash.cluetrust.net
208.72.86.134	A	mail.joodo.com
208.72.86.138	PTR	www.terrorism.com
208.72.87.26	PTR	eq.vpnlink.gbpsw.com
208.72.87.172	A	themis.ghostglass.net
208.72.87.172	A	www.ghostglass.net
208.72.87.172	A	forums.ghostglass.net
208.72.87.174	A	themis.ghostglass.net
208.72.87.174	A	www.ghostglass.net
208.72.87.174	A	forums.ghostglass.net
208.72.87.186	PTR	2a.vcdl.org
208.72.87.194	A+PTR	mail.neutral.net
208.72.87.194	A	neutral.net
208.72.87.194	A	neutralnet.us
208.72.87.196	PTR	customers.cluetrust.net
208.72.87.196	A	juliankulski.com
208.72.87.196	A	jumpwalkergroup.com
208.72.87.198	PTR	best.joss.com
208.72.87.201	PTR	zool.netpolicy.com
208.72.87.202	A	interconn.ection.org
208.72.87.202	A	amemus.org
208.72.87.202	A	dir.ection.org
208.72.87.204	PTR	p4.jetco.cluetrust.net
208.72.87.204	A	zool.netpolicy.com
208.72.87.204	A	www.enchantedworks.com
208.72.87.205	A	interconn.ection.org
208.72.87.205	A	amemus.org
208.72.87.205	A	dir.ection.org
208.72.87.249	A	black-and-decker.seastrom.com
208.72.87.255	PTR	broadcast-255.87.72.208.in-addr.arpa