Robtex

Up: 68.180.144.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 68.180.152.0/22
Down right: 68.180.156.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
68.180.154.39	A	ts.richmedia.fy9.b.yahoo.com
68.180.154.39	A	any-ts.richmedia.fy9.b.yahoo.com
68.180.154.63	A	mscity1.search.vip.ac2.yahoo.com
68.180.154.231	A	yqlengine.pipes.fy11.b.yahoo.com
68.180.155.1	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.3	PTR	loadfb1.bkln.ac2.yahoo.com
68.180.155.3	A	y-3uv44mh7s2qgp-1342638901000-c.wc.s1.b.yahoo.com
68.180.155.3	A	y-3acskk5708rjd-1343715982992-f.wc.s1.b.yahoo.com
68.180.155.7	A	y-3uv44mh7s2qgp-1342638901000-c.wc.s1.b.yahoo.com
68.180.155.7	A	y-3acskk5708rjd-1343715982992-f.wc.s1.b.yahoo.com
68.180.155.7	A	a302434.wc.s1.b.yahoo.com
68.180.155.8	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.17	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.18	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.32	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.34	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.40	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.42	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.59	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.72	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.74	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.80	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.82	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.83	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.99	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.113	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.114	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.115	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.120	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.128	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.129	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.131	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.138	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.139	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.144	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.153	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.154	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.155	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.170	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.171	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.176	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.178	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.179	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.184	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.185	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.186	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.193	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.195	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.208	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.211	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.217	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.218	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.224	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.235	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.243	PTR	unknown-68-180-155-x.yahoo.com
68.180.155.249	PTR	unknown-68-180-155-x.yahoo.com
68.180.156.15	A	rsw11-1-ysm.ac4.yahoo.com
68.180.156.43	A	lbn1-1-ysm.ac4.yahoo.com
68.180.156.62	A	rsw54-1-ysm.ac4.yahoo.com
68.180.156.130	A	bas3-1-con.ac2.yahoo.com
68.180.156.131	PTR	unknown-68-180-156-x.yahoo.com
68.180.156.132	A	lo0.bas5-1-con.ac2.yahoo.com
68.180.156.132	A	bas5-1-con.ac2.yahoo.com
68.180.157.75	A	benjaminsci.com
68.180.158.133	A	geoycpi-wf.wretch.gycpi.b.yahoodns.net
68.180.158.227	PTR	unknown-68-180-158-x.yahoo.com