Robtex

Up: 98.137.156.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 98.137.157.0/25
Down right: 98.137.157.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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+PTR	jpop200-bcp.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	PTR	unknown-98-137-157-x.yahoo.com
98.137.157.53	A	piapi.ue.gysm.yahoodns.net
98.137.157.53	A	a1.ue.video-yql.gycpi.b.yahoodns.net
98.137.157.54	PTR	finance-forward1.splunk.media.vip.ne1.yahoo.com
98.137.157.54	A	prod-proxy.mobstor.vip.ne1.yahoo.com
98.137.157.54	A	us-proxy-mobstor.g03.yahoodns.net