Robtex

Up: 98.139.16.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 98.139.16.0/22
Down right: 98.139.20.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
98.139.16.167	A	ct4-dhberr19.adx.bf1.yahoo.com
98.139.17.102	A	usw8-1-apg.bf1.yahoo.com
98.139.18.88	A	holtworker113.flickr.bf1.yahoo.com
98.139.18.128	A	www24.flickr.bf1.yahoo.com
98.139.18.183	A	www-site.flickr.vip.bf1.yahoo.com
98.139.19.2	PTR	unknown-98-139-19-x.yahoo.com
98.139.19.8	PTR	unknown-98-139-19-x.yahoo.com
98.139.19.223	A	relay108p8.us2.voice.bf1.yahoo.com
98.139.19.236	A	relay110p5.us2.voice.bf1.yahoo.com
98.139.20.144	A+PTR	ws105.progrss.bf1.yahoo.com
98.139.20.146	A	stage-f05.answers.bf1.yahoo.com
98.139.20.184	A	buster00.ysm.bf1.yahoo.com
98.139.21.0	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.1	A+PTR	ha1.po-20.bas-2-cld.bf1.yahoo.com
98.139.21.1	A	bahamasgiveaways.net
98.139.21.1	A	tropicalvaca.net
98.139.21.16	A+PTR	fe1.l3.sports.vip.bf1.yahoo.com
98.139.21.18	A+PTR	ws1.yoscs.vip.bf1.yahoo.com
98.139.21.18	A	credstore.g01.yahoodns.net
98.139.21.31	A	fo-us2.production.mh.web.ysta1.b.yahoo.com
98.139.21.31	A	fe.syc.search.vip.bf1.yahoo.com
98.139.21.45	A	pxe-farm6.static.flickr.a00.yahoodns.net
98.139.21.45	A	storage6-l3.flickr.vip.bf1.yahoo.com
98.139.21.45	A	farm6.staticflickr.com
98.139.21.52	A	any-media.groups.a03.yahoodns.net
98.139.21.52	A	media.groups.g03.yahoodns.net
98.139.21.56	A+PTR	aptui51.adx.vip.bf1.yahoo.com
98.139.21.57	PTR	aptuiauth.adx.vip.bf1.yahoo.com
98.139.21.57	A	apt1.login.gapx.yahoodns.net
98.139.21.67	A	sdarla.a03.yahoodns.net
98.139.21.75	A+PTR	ads.adx.vip.bf1.yahoo.com
98.139.21.77	A	img.sports.yahoo.com
98.139.21.77	A	real.gs.sports.a03.yahoodns.net
98.139.21.77	A	real.gs.sports.yahoo.com
98.139.21.86	A	wiki.cloudparty.com
98.139.21.86	A	a.cloudparty.com
98.139.21.86	A	forums.cloudparty.com
98.139.21.96	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.101	A	api-test.yieldmanager.com
98.139.21.103	A	ym.adstract.com
98.139.21.103	A	my.xtendmedia.com
98.139.21.103	A	my.media-servers.net
98.139.21.107	PTR	beta.ngd.vip.bf1.yahoo.com
98.139.21.107	A	beta.yieldmanager.com
98.139.21.109	A	answers.yahoo.com.ph
98.139.21.109	A	api.answers.yahoo.com
98.139.21.109	A	feu.answers.yahoo.com
98.139.21.135	A	console.vap.vip.bf1.yahoo.net
98.139.21.136	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.137	PTR	vporigin.vap.vip.bf1.yahoo.com
98.139.21.138	PTR	vporigin.yvap.vip.bf1.yahoo.com
98.139.21.139	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.140	A	sorryadx.adx.vip.bf1.yahoo.com
98.139.21.140	A	www6101.apt.apx.yahoodns.net
98.139.21.141	A	sorryadxauth.adx.vip.bf1.yahoo.com
98.139.21.144	A+PTR	iws.adx.vip.bf1.yahoo.com
98.139.21.145	A+PTR	bcpgeoapi1.adx.vip.bf1.yahoo.com
98.139.21.146	PTR	bcpiws.adx.vip.bf1.yahoo.com
98.139.21.147	A+PTR	bcpnetewsbcp1.adx.vip.bf1.yahoo.com
98.139.21.148	A	bcpsrchqrsbcp1.adx.vip.bf1.yahoo.com
98.139.21.152	A+PTR	bf1-daxsign.adx.vip.bf1.yahoo.com
98.139.21.153	PTR	daxredir2.adx.vip.bf1.yahoo.com
98.139.21.154	A+PTR	inxaptgw.adx.vip.bf1.yahoo.com
98.139.21.155	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.160	A+PTR	pricing.vip.bf1.yahoo.com
98.139.21.161	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.162	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.163	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.164	A	ufe1.cb.g01.yahoodns.net
98.139.21.168	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.169	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.169	A	edit.in.yahoo.com
98.139.21.169	A	login.korea.yahoo.com
98.139.21.170	PTR	ads1.cbs.vip.bf1.yahoo.com
98.139.21.171	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.176	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.177	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.178	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.179	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.184	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.185	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.186	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.187	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.192	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.193	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.194	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.195	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.200	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.201	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.202	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.203	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.208	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.209	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.210	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.211	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.216	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.217	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.218	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.219	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.224	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.225	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.226	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.227	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.232	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.233	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.234	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.235	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.240	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.241	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.242	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.243	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.248	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.249	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.250	PTR	unknown-98-139-21-x.yahoo.com
98.139.21.251	PTR	unknown-98-139-21-x.yahoo.com
98.139.22.20	A	fan-filer3.sports.bf1.yahoo.com
98.139.22.21	A	fan-filer4.sports.bf1.yahoo.com
98.139.22.24	A+PTR	mrest28.citizen.bf1.yahoo.com
98.139.22.155	A+PTR	bf1-1addb-003-v.adx.bf1.yahoo.com
98.139.22.216	A+PTR	gd1256.adx.bf1.yahoo.com
98.139.22.217	A+PTR	gd1254.adx.bf1.yahoo.com
98.139.22.220	A	gd1248.adx.bf1.yahoo.com
98.139.22.222	A	gd1272.adx.bf1.yahoo.com
98.139.22.241	A+PTR	gd5462.adx.bf1.yahoo.com
98.139.22.242	A+PTR	gd5460.adx.bf1.yahoo.com
98.139.22.243	A+PTR	gd5458.adx.bf1.yahoo.com
98.139.22.245	A	gd5454.adx.bf1.yahoo.com
98.139.22.249	A+PTR	gd1268.adx.bf1.yahoo.com
98.139.22.250	A+PTR	gd1266.adx.bf1.yahoo.com
98.139.22.252	A	gd1262.adx.bf1.yahoo.com
98.139.23.49	PTR	unknown-98-139-23-x.yahoo.com
98.139.23.244	A	gd5457.adx.bf1.yahoo.com