Robtex

Up: 98.139.96.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 98.139.100.0/23
Down right: 98.139.102.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
98.139.100.33	A+PTR	bf1-ccdb-002.data.bf1.yahoo.com
98.139.100.35	PTR	unknown.yahoo.com
98.139.100.35	A	yap-int.g1.b.yahoo.com
98.139.100.35	A	any.yap-int.a1.b.yahoo.com
98.139.100.37	PTR	ycamsbcpweb02.cc.bf1.yahoo.com
98.139.100.37	A	extbcpappstatus02.cc.bf1.yahoo.com
98.139.100.113	A+PTR	src2.ops.bf1.yahoo.com
98.139.100.125	A	vespa-feeder2.travel.bf1.yahoo.com
98.139.101.177	A	177.101.139.98.aprez.ostk.prod.bf1.yahoo.com
98.139.102.7	PTR	p1.login.vip.bf1.yahoo.com
98.139.102.7	A	protect-new.login.lga1.b.yahoo.com
98.139.102.46	PTR	unknown-98-139-102-x.yahoo.com
98.139.102.48	A+PTR	fe1.autos.canada.vip.bf1.yahoo.com
98.139.102.55	PTR	unknown-98-139-102-x.yahoo.com
98.139.102.55	A	in.bookmarks.yahoo.com
98.139.102.55	A	myweb2.search.yahoo.com
98.139.102.95	A+PTR	webpeercdn.qwk.bf1.yahoo.com
98.139.102.95	A	peercdn.com
98.139.102.103	PTR	103.102.139.98.aprez.ostk.prod.bf1.yahoo.com
98.139.102.103	A	builder1-vm7.uus.yos.yahoo.com
98.139.102.110	A+PTR	mobile1.login.vip.bf1.yahoo.com
98.139.102.125	PTR	unknown-98-139-102-x.yahoo.com
98.139.102.128	PTR	ytsmrs1.mobile.vip.bf1.yahoo.com
98.139.102.128	A	mrs.o.yimg.com
98.139.102.128	A	mrs1.mobile.g02.yahoodns.net
98.139.102.145	PTR	145.102.139.98.aprez.ostk.prod.bf1.yahoo.com
98.139.102.145	A	feedback.help.yahoo.com
98.139.102.145	A	espanol.travel.yahoo.com
98.139.102.160	A	a01.yrl.bf1.yahoo.com
98.139.102.176	A+PTR	fe.sitex.search.vip.bf1.yahoo.com
98.139.102.177	PTR	shareddb1.stage.ypost.vip.bf1.yahoo.com
98.139.102.179	A+PTR	rmaicic.ads.vip.bf1.yahoo.com
98.139.102.236	A	236.102.139.98.aprez.ostk.prod.bf1.yahoo.com
98.139.103.51	A	51.103.139.98.aprez.ostk.prod.bf1.yahoo.com
98.139.103.103	PTR	unknown-98-139-103-x.yahoo.com
98.139.103.163	PTR	unknown-98-139-103-x.yahoo.com
98.139.103.163	A	163.103.139.98.aprez.ostk.prod.bf1.yahoo.com
98.139.103.194	A	194.103.139.98.aprez.ostk.prod.bf1.yahoo.com
98.139.103.205	PTR	unknown-98-139-103-x.yahoo.com