Robtex

Up: 183.177.80.0/22
Can't show all results, try to descend to a more specific CIDR
Down left: 183.177.80.0/24
Down right: 183.177.81.0/24
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
183.177.80.0	PTR	unknown-183-177-80-x.yahoo.com
183.177.80.3	PTR	unknown-183-177-80-x.yahoo.com
183.177.80.3	A	ge-0-1-5-d5.pat2.krx.yahoo.com
183.177.80.15	PTR	unknown.yahoo.com
183.177.80.52	PTR	unknown-183-177-80-x.yahoo.com
183.177.80.64	A+PTR	g1.bkln.kry.yahoo.com
183.177.80.116	A	admin-hv1.ops.sgx.yahoo.com
183.177.80.221	PTR	unknown-183-177-80-x.yahoo.com
183.177.81.68	PTR	slb1.jpx.yahoo.com
183.177.81.70	PTR	unknown.yahoo.com
183.177.81.70	A	y-3hbh6mt7ht66q-1333265189000.wc.s1.b.yahoo.com
183.177.81.70	A	*.0ud.bkln.wc.s1.b.yahoodns.net
183.177.81.71	PTR	unknown-183-177-81-x.yahoo.com
183.177.81.71	A	*.0ud.bkln.wc.s1.b.yahoodns.net
183.177.81.71	A	y-3ij2cnt7nkuku-1340665336000.wc.s1.b.yahoo.com
183.177.81.73	PTR	r04.ycpi.jpx.yahoo.net
183.177.81.74	PTR	r1.ycpi.vip.jpx.yahoo.net
183.177.81.74	A	us.mc1617.mail.yahoo.com
183.177.81.74	A	a5.m.yahoo.com
183.177.81.75	PTR	unknown-183-177-81-x.yahoo.com
183.177.81.75	A	us.mc1617.mail.yahoo.com
183.177.81.75	A	a5.m.yahoo.com
183.177.81.85	A+PTR	r10.ycpi.jpx.yahoo.net
183.177.81.245	PTR	unknown-183-177-81-x.yahoo.com
183.177.81.255	PTR	unknown-183-177-81-x.yahoo.com