Robtex

Up: 121.101.128.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 121.101.144.0/21
Down right: 121.101.152.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
121.101.144.0	PTR	unknown-121-101-144-x.yahoo.com
121.101.144.1	A	ha1.vl-120.bas-1-edg.hka.yahoo.com
121.101.144.8	A	l1.ycs.vip.hka.yahoo.com
121.101.144.96	PTR	unknown-121-101-144-x.yahoo.com
121.101.144.96	A	*.m2t9.bkln.wc.s1.b.yahoodns.net
121.101.144.96	A	y-3hbh6mt7ht66q-1333265189494.wc.s1.b.yahoo.com
121.101.144.97	PTR	unknown-121-101-144-x.yahoo.com
121.101.144.97	A	*.m2t9.bkln.wc.s1.b.yahoodns.net
121.101.144.97	A	y-3hbh6mt7ht66q-1333265189494.wc.s1.b.yahoo.com
121.101.144.112	PTR	unknown.yahoo.com
121.101.144.112	A	fo-hki-ycpi-uno.gycpi.b.yahoodns.net
121.101.144.112	A	mc1255.mail.yahoo.com
121.101.144.116	A	fo-hki-ycpi-uno.gycpi.b.yahoodns.net
121.101.144.116	A	mc1255.mail.yahoo.com
121.101.144.116	A	www.farechase.com
121.101.144.139	A	ns6.yahoo.com
121.101.145.1	A+PTR	ha1.vl-105.bas-a.in.yahoo.com
121.101.145.2	A+PTR	ha2.vl-105.bas-a.in.yahoo.com
121.101.145.65	PTR	ha1.vl-45.bas-a.in.yahoo.com
121.101.145.67	A+PTR	vl-45.bas-a1.in.yahoo.com
121.101.145.68	A	vl-45.bas-a2.in.yahoo.com
121.101.145.131	A+PTR	vl-44.bas-a1.in.yahoo.com
121.101.145.145	PTR	unknown-121-101-145-x.yahoo.com
121.101.145.160	PTR	unknown-121-101-145-x.yahoo.com
121.101.145.163	PTR	unknown-121-101-145-x.yahoo.com
121.101.145.192	PTR	unknown-121-101-145-x.yahoo.com
121.101.145.208	PTR	unknown-121-101-145-x.yahoo.com
121.101.145.224	PTR	unknown-121-101-145-x.yahoo.com
121.101.146.2	A+PTR	ha2.vl-43.bas-a.in.yahoo.com
121.101.146.7	A	vl43.si1.yahoo.com
121.101.146.43	A	in.beta.vip.in.yahoo.com
121.101.146.51	A+PTR	lang1.www.vip.in.yahoo.com
121.101.146.65	A	cgi.promo.vip.in.yahoo.com
121.101.146.71	A	img.vip.in.yahoo.com
121.101.146.134	A	chat.yahoo.co.in
121.101.146.134	A	prop1.vip.in.yahoo.com
121.101.146.145	PTR	unknown-121-101-146-x.yahoo.com
121.101.146.146	PTR	unknown-121-101-146-x.yahoo.com
121.101.146.153	A	score112.coke.in.yahoo.com
121.101.146.179	A+PTR	beta.news.vip.in.yahoo.com
121.101.146.179	A	news.in.g1.b.yahoo.com
121.101.146.197	A	score108.coke.in.yahoo.com
121.101.146.208	A+PTR	staging-vm3.news.yahoo.com
121.101.147.0	PTR	unknown-121-101-147-x.yahoo.com
121.101.147.48	PTR	unknown-121-101-147-x.yahoo.com
121.101.147.193	PTR	unknown-121-101-147-x.yahoo.com
121.101.147.241	PTR	score.coke.vip.in.yahoo.com
121.101.148.17	PTR	unknown.yahoo.com
121.101.148.128	A+PTR	mta-v1.mail.vip.in.yahoo.com
121.101.148.130	PTR	unknown.yahoo.com
121.101.148.161	PTR	unknown-121-101-148-x.yahoo.com
121.101.148.210	PTR	unknown-121-101-148-x.yahoo.com
121.101.148.224	PTR	unknown-121-101-148-x.yahoo.com
121.101.149.253	A	sherpa-req2.dht.vip.in2.yahoo.com
121.101.150.0	PTR	unknown-121-101-150-x.yahoo.com
121.101.150.47	A	cg950.mail.vip.in.yahoo.com
121.101.150.61	A	as102.mail.vip.in.yahoo.com
121.101.150.61	A	as102.mail.in.yahoo.com
121.101.150.66	PTR	crawler042-new.mail.in.yahoo.com
121.101.150.81	PTR	unknown-121-101-150-x.yahoo.com
121.101.150.102	A	attach.mail.vip.in.yahoo.com
121.101.150.103	A	f957.mail.vip.in.yahoo.com
121.101.150.114	A+PTR	bs1.mail.vip.in.yahoo.com
121.101.150.121	A	as11001.mail.in.yahoo.com
121.101.150.123	A	as11003.mail.in.yahoo.com
121.101.150.176	PTR	ds30015.vespa.mail.in.yahoo.com
121.101.150.177	A+PTR	ds30016.vespa.mail.in.yahoo.com
121.101.150.193	PTR	unknown-121-101-150-x.yahoo.com
121.101.151.2	PTR	unknown-121-101-151-x.yahoo.com
121.101.151.33	PTR	unknown-121-101-151-x.yahoo.com
121.101.151.67	PTR	unknown-121-101-151-x.yahoo.com
121.101.151.144	PTR	unknown-121-101-151-x.yahoo.com
121.101.151.160	PTR	unknown-121-101-151-x.yahoo.com
121.101.151.209	A+PTR	nm4-vm1.bullet.mail.in.yahoo.com
121.101.151.210	A+PTR	nm2-vm0.bullet.mail.in.yahoo.com
121.101.151.211	PTR	nm1-vm0.bullet.mail.in.yahoo.com
121.101.151.238	A	anupamtimes.com
121.101.151.250	A	nm2-vm1.bullet.mail.in.yahoo.com
121.101.152.1	A+PTR	ha1.vl-37.bas-a.in.yahoo.com
121.101.152.2	PTR	ha2.vl-37.bas-a.in.yahoo.com
121.101.152.3	PTR	vl-37.bas-a1.in.yahoo.com
121.101.152.26	A	ntest1.ops.in.yahoo.com
121.101.152.72	A	fe-staging.in.yahoo.com
121.101.152.73	A	image-staging.in.yahoo.com
121.101.152.74	A	chapi1.nhub.app.vip.in.yahoo.com
121.101.152.75	A	acache1.nhub.app.vip.in.yahoo.com
121.101.152.80	A+PTR	db1.nhub.app.vip.in.yahoo.com
121.101.152.89	A	cdb2-tmp.in.yahoo.com
121.101.152.99	PTR	unknown-121-101-152-x.yahoo.com
121.101.152.114	PTR	unknown-121-101-152-x.yahoo.com
121.101.152.160	A+PTR	ws1.yoscs.vip.in.yahoo.com
121.101.152.189	A	ard.vip.in.yahoo.com
121.101.152.202	A	rise.intl.ibs.search.vip.in.yahoo.com
121.101.152.204	A	dpc.intl.ibs.search.vip.in.yahoo.com
121.101.152.213	A	h3-vm2.app.in.yahoo.com
121.101.152.214	A	h3-vm3.app.in.yahoo.com
121.101.152.215	A	h4-vm1.app.in.yahoo.com
121.101.152.216	A	h4-vm2.app.in.yahoo.com
121.101.152.224	A	w1.fp.vip.in.yahoo.com
121.101.152.225	PTR	df1.fp.vip.in.yahoo.com
121.101.152.226	A+PTR	oc1.fp.vip.in.yahoo.com
121.101.152.227	A+PTR	mds1.fp.vip.in.yahoo.com
121.101.152.231	A	cache1.intl-ch.vip.in.yahoo.com
121.101.153.1	A+PTR	yts1.socdir.vip.in.yahoo.com
121.101.153.19	A+PTR	cache.capany.search.vip.in.yahoo.com
121.101.153.59	A	c5a.ah.vip.in.yahoo.com
121.101.153.67	PTR	unknown-121-101-153-x.yahoo.com
121.101.153.192	PTR	unknown-121-101-153-x.yahoo.com
121.101.153.207	A	d102.dist.in.yahoo.com
121.101.153.221	A	perf1.inf.vip.in.yahoo.com
121.101.153.234	A	in.alerts.mobile.yahoo.com
121.101.153.237	A	s.search.vip.in.yahoo.com
121.101.153.240	A	subdb1.mobile.vip.in.yahoo.com
121.101.153.241	A+PTR	subgw1.mobile.vip.in.yahoo.com
121.101.153.244	A	promo.media.vip.in.yahoo.com
121.101.156.1	A+PTR	ha1.vl-40.bas-a.in.yahoo.com
121.101.156.9	A	iccwomensworldcup.yahoo.net
121.101.156.9	A	iccworldcupqualifier.yahoo.net
121.101.156.9	A	wcldiv1.yahoo.net
121.101.156.27	A	fe.icc.vip.in.yahoo.net
121.101.156.48	PTR	unknown-121-101-156-x.yahoo.com
121.101.156.131	A	vl-42.bas-a1.in.yahoo.com
121.101.156.200	A	xe-3-1-0.msr2.in.yahoo.com
121.101.156.206	A	xe-2-1-0.msr1.in.yahoo.com
121.101.156.208	A+PTR	ge-0-3-1.msr2.in.yahoo.com
121.101.156.210	PTR	ge-0-3-1.msr1.in.yahoo.com
121.101.156.218	A	xe-2-2-0.msr1.in.yahoo.com
121.101.156.224	A+PTR	xe-1-3-0.msr1.in.yahoo.com
121.101.156.228	A	xe-1-3-0.msr2.in.yahoo.com
121.101.157.20	A	wpe-client02-vm2.ops.in.yahoo.com
121.101.157.50	PTR	unknown-121-101-157-x.yahoo.com
121.101.157.97	PTR	unknown-121-101-157-x.yahoo.com
121.101.157.129	A+PTR	ha1.vl-36.bas-a.in.yahoo.com
121.101.157.130	A+PTR	ha2.vl-36.bas-a.in.yahoo.com
121.101.157.139	A	admin01.zcs.mail.in.yahoo.com
121.101.157.157	A	vmbs311.zcs.mail.in.yahoo.com
121.101.157.208	A+PTR	nfsp302.zcs.mail.in.yahoo.com
121.101.157.239	A	vmbs331.zcs.mail.in.yahoo.com
121.101.158.5	A	si-a3.vl027.in2.yahoo.com
121.101.158.17	PTR	unknown-121-101-158-x.yahoo.com
121.101.158.37	A	sdb.ls.vip.in2.yahoo.com
121.101.158.67	PTR	api.staging.cricket.vip.in2.yahoo.com
121.101.158.75	A	ed1.news.vip.in2.yahoo.com
121.101.158.114	PTR	unknown-121-101-158-x.yahoo.com
121.101.158.152	A	ycricketblog.com
121.101.158.157	A	yns104.qa.in2.yahoo.com
121.101.158.162	PTR	unknown-121-101-158-x.yahoo.com
121.101.158.176	PTR	unknown-121-101-158-x.yahoo.com
121.101.158.193	PTR	unknown-121-101-158-x.yahoo.com
121.101.158.199	A	global1.ads.vip.in2.yahoo.com
121.101.159.25	A	p1db2.geo.in2.in.hostingprod.com
121.101.159.50	PTR	unknown-121-101-159-x.yahoo.com
121.101.159.211	PTR	unknown-121-101-159-x.yahoo.com