Robtex

Up: 27.123.32.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 27.123.48.0/21
Down right: 27.123.56.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
27.123.48.3	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.32	PTR	loadfb3.bkln.tp2.yahoo.com
27.123.48.32	A	y-3ij2cnt7nkuku-1340665336000.wc.s1.b.yahoo.com
27.123.48.32	A	y-3uv44mh7s2qgp-1342638901000-c.wc.s1.b.yahoo.com
27.123.48.33	PTR	loadfb4.bkln.tp2.yahoo.com
27.123.48.33	A	y-3ij2cnt7nkuku-1340665336000.wc.s1.b.yahoo.com
27.123.48.33	A	y-3uv44mh7s2qgp-1342638901000-c.wc.s1.b.yahoo.com
27.123.48.81	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.82	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.130	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.161	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.178	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.179	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.192	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.193	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.195	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.208	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.210	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.224	PTR	unknown-27-123-48-x.yahoo.com
27.123.48.243	PTR	unknown-27-123-48-x.yahoo.com
27.123.50.0	PTR	unknown-27-123-50-x.yahoo.com
27.123.50.44	A	polaris-zookeeper01.ac.tp2.yahoo.com
27.123.50.45	A	ats1.apple-finance.yql.vip.tp2.yahoo.com
27.123.51.0	PTR	unknown-27-123-51-x.yahoo.com
27.123.51.80	A+PTR	ec1.ycs.vip.tp2.yahoo.net
27.123.51.80	A	geo-ec.gy1.b.yahoodns.net
27.123.51.89	A	ct1.ycs.vip.tp2.yahoo.net
27.123.55.1	PTR	unknown-27-123-55-x.yahoo.com
27.123.59.194	PTR	unknown-27-123-59-x.yahoo.com
27.123.59.210	PTR	unknown-27-123-59-x.yahoo.com
27.123.59.240	PTR	unknown-27-123-59-x.yahoo.com
27.123.61.1	PTR	unknown-27-123-61-x.yahoo.com
27.123.63.1	PTR	unknown-27-123-63-x.yahoo.com
27.123.63.128	PTR	unknown-27-123-63-x.yahoo.com
27.123.63.243	PTR	unknown-27-123-63-x.yahoo.com