Robtex

Up: 98.139.24.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 98.139.28.0/23
Down right: 98.139.30.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
98.139.28.139	A	ftps2.store.bf1.yahoo.com
98.139.28.140	PTR	unknown-98-139-28-x.yahoo.com
98.139.28.140	A	coats.store.vip.bf1.yahoo.com
98.139.28.141	A+PTR	rats.store.vip.bf1.yahoo.com
98.139.28.141	A	img.store.yahoodns.net
98.139.28.142	PTR	unknown-98-139-28-x.yahoo.com
98.139.28.142	A	sdco.store.vip.bf1.yahoo.com
98.139.28.143	PTR	unknown-98-139-28-x.yahoo.com
98.139.28.144	PTR	unknown-98-139-28-x.yahoo.com
98.139.28.144	A	presalesats.sbs.g03.yahoodns.net
98.139.28.144	A	luminate.com
98.139.28.145	PTR	phtml3.store.vip.bf1.yahoo.com
98.139.28.149	PTR	mon1002.yss.bf1.yahoo.com
98.139.28.149	A	yahoosites.com
98.139.28.149	A	orderstoreyahoo.com
98.139.28.150	PTR	mon1004.yss.bf1.yahoo.com
98.139.28.151	PTR	unknown-98-139-28-x.yahoo.com
98.139.30.24	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.38	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.56	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.60	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.61	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.80	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.83	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.99	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.123	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.125	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.130	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.144	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.165	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.178	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.213	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.216	PTR	unknown-98-139-30-x.yahoo.com
98.139.30.236	A+PTR	node3.cbe.maktoob.bf1.yahoo.com
98.139.30.236	A	login.maktoob.com
98.139.30.248	PTR	unknown-98-139-30-x.yahoo.com
98.139.31.193	A	fan162.sports.bf1.yahoo.com
98.139.31.235	A	fan148.sports.bf1.yahoo.com