Robtex

Up: 98.137.144.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 98.137.152.0/22
Down right: 98.137.156.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
98.137.154.142	A	cns1.yahoo.com
98.137.154.143	A	cns3.yahoo.com
98.137.155.8	PTR	spdc.pbp.vip.ne1.yahoo.com
98.137.155.9	PTR	web11.shop.sp2.yahoo.com
98.137.155.9	A	cms.it.a03.yahoodns.net
98.137.155.11	PTR	web13.shop.sp2.yahoo.com
98.137.155.11	A	geo-yql.g05.yahoodns.net
98.137.155.11	A	media-router-omega1.prod.media.vip.ne1.yahoo.com
98.137.155.174	A	web-all.esb.nacs.g05.yahoodns.net
98.137.156.136	A+PTR	ats2.member.vip.ne1.yahoo.com
98.137.156.136	A	openauth.aol.akadns.net
98.137.156.136	A	any-ats.member.a02.yahoodns.net
98.137.156.137	A+PTR	media-router-brb71.prod.media.vip.ne1.yahoo.com
98.137.157.24	PTR	ep1.dist.vip.ne1.yahoo.com
98.137.157.24	A	edge.dist.g04.yahoodns.net
98.137.157.27	PTR	yxen6.qa.media.pool.corp.sp2.yahoo.com
98.137.157.43	PTR	unknown.yahoo.com
98.137.157.43	A	mx-aol.mail.gm0.yahoodns.net
98.137.157.43	A	mta-v1.aol.mail.vip.ne1.yahoo.com
98.137.157.46	A	fo-jpop.mail.am0.yahoodns.net
98.137.157.46	A	fo-jpop.mail.rog.gm0.yahoodns.net
98.137.157.53	A	piapi.ue.gysm.yahoodns.net
98.137.157.53	A	a1.ue.video-yql.gycpi.b.yahoodns.net
98.137.157.53	A	a1.ue.sportsreel.gycpi.b.yahoodns.net
98.137.158.42	PTR	smtp-att1.mail-prod1.omega.vip.ne1.yahoo.com
98.137.158.43	PTR	smtp-star1.mail-prod1.omega.vip.ne1.yahoo.com
98.137.158.43	A	smtp-mob.biz.mail.global.gm0.yahoodns.net
98.137.158.44	A	smtp-rog.mail.a03.yahoodns.net
98.137.158.135	A	ds-comet.yahoo.g01.yahoodns.net
98.137.158.139	A+PTR	ws2.progrss.vip.ne1.yahoo.com
98.137.159.1	A+PTR	ha1.vl-121.usw-1-lbc.ne1.yahoo.com
98.137.159.2	PTR	ha2.vl-121.usw-1-lbc.ne1.yahoo.com
98.137.159.3	A+PTR	vl-121.usw1-1-lbc.ne1.yahoo.com
98.137.159.5	A	vl-121.slb1-1-lbc.ne1.yahoo.com
98.137.159.8	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.9	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.10	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.11	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.17	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.18	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.19	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.24	PTR	unknown.yahoo.com
98.137.159.24	A	mta7.am0.yahoodns.net
98.137.159.24	A	mta6.am0.yahoodns.net
98.137.159.25	PTR	unknown.yahoo.com
98.137.159.25	A	mta6.am0.yahoodns.net
98.137.159.25	A	mta5.am0.yahoodns.net
98.137.159.26	PTR	unknown.yahoo.com
98.137.159.26	A	mta7.am0.yahoodns.net
98.137.159.26	A	mta6.am0.yahoodns.net
98.137.159.27	PTR	unknown.yahoo.com
98.137.159.27	A	mta7.am0.yahoodns.net
98.137.159.27	A	mta6.am0.yahoodns.net
98.137.159.28	A	mta7.am0.yahoodns.net
98.137.159.28	A	mta6.am0.yahoodns.net
98.137.159.28	A	mta5.am0.yahoodns.net
98.137.159.32	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.33	A+PTR	api-r.soln-stage.hsvc.cp.vip.ne1.yahoo.com
98.137.159.34	PTR	stg-gateway.primary.pint.vip.ne1.yahoo.com
98.137.159.35	A+PTR	sky-test.mail.vip.ne1.yahoo.com
98.137.159.36	A	slw1.fp.vip.ne1.yahoo.com
98.137.159.38	A	slmds1.fp.vip.ne1.yahoo.com
98.137.159.40	A+PTR	ynodejs-tdmy1.canary.fp.vip.ne1.yahoo.com
98.137.159.41	A+PTR	sky200-3.mail.vip.ne1.yahoo.com
98.137.159.42	A+PTR	api.isvc.cp.vip.ne1.yahoo.com
98.137.159.43	A+PTR	qrs.snippet.pint.vip.ne1.yahoo.com
98.137.159.48	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.48	A	ds-comet.yahoo.g01.yahoodns.net
98.137.159.48	A	public1.comet.vip.ne1.yahoo.com
98.137.159.49	A+PTR	ws1.yoscs.vip.ne1.yahoo.com
98.137.159.53	A	api1.soln-stage.isvc.cp.vip.ne1.yahoo.com
98.137.159.58	PTR	web2.tusw30.mobstor.mbst.pool.corp.sp2.yahoo.com
98.137.159.58	A	mtarelay-new.am0.yahoodns.net
98.137.159.60	A	sky200-aol-sec.mail.vip.ne1.yahoo.com
98.137.159.62	A	test2-imap.mail.vip.ne1.yahoo.com
98.137.159.64	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.65	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.66	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.67	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.72	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.73	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.74	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.75	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.80	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.81	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.82	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.83	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.88	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.89	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.90	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.91	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.96	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.97	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.98	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.99	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.104	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.105	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.106	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.107	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.112	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.113	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.114	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.115	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.120	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.121	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.122	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.123	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.136	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.137	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.138	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.139	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.144	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.145	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.146	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.152	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.153	PTR	unknown.yahoo.com
98.137.159.154	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.155	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.160	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.161	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.162	PTR	unknown.yahoo.com
98.137.159.163	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.168	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.169	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.170	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.171	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.176	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.177	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.178	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.179	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.184	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.185	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.232	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.233	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.240	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.241	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.242	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.243	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.248	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.249	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.250	PTR	unknown-98-137-159-x.yahoo.com
98.137.159.251	PTR	unknown-98-137-159-x.yahoo.com