Robtex

Up: 98.137.170.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 98.137.170.0/25
Down right: 98.137.170.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
98.137.170.13	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.18	A+PTR	av-beap.adx.vip.gq1.yahoo.com
98.137.170.18	A	beapav.bc.gysm.yahoodns.net
98.137.170.31	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.32	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.32	A	csc.beap.ad.yieldmanager.net
98.137.170.32	A	csc-beap.adx.vip.gq1.yahoo.com
98.137.170.33	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.33	A	fr.adserver.yahoo.com
98.137.170.33	A	scrserv.amp.yahoo.com
98.137.170.34	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.65	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.66	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.82	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.135	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.136	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.146	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.156	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.160	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.169	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.173	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.177	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.191	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.192	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.193	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.195	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.203	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.233	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.236	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.244	PTR	unknown-98-137-170-x.yahoo.com
98.137.170.245	PTR	unknown-98-137-170-x.yahoo.com