Robtex

Up: 66.6.33.0/25
Can't show all results, try to descend to a more specific CIDR
Down left: 66.6.33.0/27
Down right: 66.6.33.32/27
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
66.6.33.1	A+PTR	gw-vlan300.it-gw.jfk02.as33612.net
66.6.33.21	A	blackphoenix77.tumblr.com
66.6.33.21	A	medion-preis.tumblr.com
66.6.33.21	A	foodandmovecaptions.tumblr.com
66.6.33.22	A	www.rebdo.org
66.6.33.22	A	www.gusty.tk
66.6.33.22	A	news.letterboxd.com
66.6.33.24	A	tumblrstream.com
66.6.33.25	A	bf2.origin.tumblr.com
66.6.33.25	A	brooklyn.sre-perim.com
66.6.33.26	A	secure.tumblr.com
66.6.33.27	A	tmblr.co
66.6.33.28	A	safe.txmblr.com
66.6.33.30	A	tomasx.com
66.6.33.31	PTR	bcast-vlan300.it-gw.jfk02.as33612.net
66.6.33.31	A	t.umblr.com
66.6.33.31	A	justinwallis.com
66.6.33.34	A	experimentr.srvcs.tumblr.com
66.6.33.34	A	telegraph.srvcs.tumblr.com
66.6.33.34	A	cspreports.srvcs.tumblr.com