Robtex

Up: 66.6.32.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 66.6.32.0/25
Down right: 66.6.32.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.6.32.0	A+PTR	network-vlan100.dfw01.as33612.net
66.6.32.2	A+PTR	gw-vlan100.core01.dfw01.as33612.net
66.6.32.3	A+PTR	gw-vlan100.core02.dfw01.as33612.net
66.6.32.7	A+PTR	bcast-vlan100.dfw01.as33612.net
66.6.32.8	A+PTR	network-vlan101.dfw01.as33612.net
66.6.32.9	A+PTR	gw-vlan101.dfw01.as33612.net
66.6.32.10	PTR	gw-vlan101.core01.dfw01.as33612.net
66.6.32.16	A+PTR	network-vlan103.dfw01.as33612.net
66.6.32.18	A+PTR	gw-vlan103.core01.dfw01.as33612.net
66.6.32.21	A	blackphoenix77.tumblr.com
66.6.32.21	A	medion-preis.tumblr.com
66.6.32.21	A	foodandmovecaptions.tumblr.com
66.6.32.22	A	www.rebdo.org
66.6.32.22	A	www.gusty.tk
66.6.32.22	A	news.letterboxd.com
66.6.32.23	PTR	bcast-vlan103.dfw01.as33612.net
66.6.32.24	PTR	network-vlan106.dfw01.as33612.net
66.6.32.24	A	tumblrstream.com
66.6.32.25	A+PTR	gw-vlan106.dfw01.as33612.net
66.6.32.25	A	bf2.origin.tumblr.com
66.6.32.25	A	brooklyn.sre-perim.com
66.6.32.26	A+PTR	gw-vlan106.core01.dfw01.as33612.net
66.6.32.26	A	secure.tumblr.com
66.6.32.27	A+PTR	gw-vlan106.core02.dfw01.as33612.net
66.6.32.27	A	tmblr.co
66.6.32.28	A	safe.txmblr.com
66.6.32.31	A+PTR	bcast-vlan106.dfw01.as33612.net
66.6.32.31	A	t.umblr.com
66.6.32.31	A	tumblr.com
66.6.32.33	PTR	gw-vlan105.dfw01.as33612.net
66.6.32.34	A+PTR	gw-vlan105.core01.dfw01.as33612.net
66.6.32.34	A	experimentr.srvcs.tumblr.com
66.6.32.34	A	telegraph.srvcs.tumblr.com
66.6.32.35	PTR	gw-vlan105.core02.dfw01.as33612.net
66.6.32.47	A+PTR	bcast-vlan105.dfw01.as33612.net
66.6.32.133	A	178.38.116profile.nashtari.tumblr.com
66.6.32.133	A	mel-fabregas-does-not-write-his-own-questions.melfabregas.tumblr.com
66.6.32.134	A	fraudster.mel-fabregas-does-not-write-his-own-questions.veritasradio.tumblr.com
66.6.32.136	A	afsstore.euro.cheapcabinsingatlinburgtn.tumblr.com
66.6.32.136	A	gator719.nashtari.tumblr.com
66.6.32.152	A	mellyssaangeldiggs.com
66.6.32.162	A	experimentr.srvcs.tumblr.com
66.6.32.162	A	telegraph.srvcs.tumblr.com
66.6.32.162	A	cspreports.srvcs.tumblr.com