Robtex

Up: 98.139.198.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 98.139.199.0/25
Down right: 98.139.199.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
98.139.199.2	PTR	unknown-98-139-199-x.yahoo.com
98.139.199.20	PTR	api-05.igor.bf1.yahoo.com
98.139.199.55	PTR	db-06.roles.bf1.yahoo.com
98.139.199.105	PTR	unknown-98-139-199-x.yahoo.com
98.139.199.105	A	cm3transport16.ops.bf1.yahoo.com
98.139.199.139	A+PTR	q2.ycpi.bf1.yahoo.net
98.139.199.144	A+PTR	q11.ycpi.bf1.yahoo.net
98.139.199.158	PTR	unknown.yahoo.com
98.139.199.158	A	u-aec41w5wtm.wc.yahoodns.net
98.139.199.158	A	t-cu3rmwoy98.wc.yahoodns.net
98.139.199.159	PTR	unknown-98-139-199-x.yahoo.com
98.139.199.159	A	r-u-beii4jfoc8report.wc.yahoodns.net
98.139.199.159	A	t-cbuiwt2bqz.wc.yahoodns.net
98.139.199.171	A	r14.ycpi.bf1.yahoo.net
98.139.199.194	PTR	unknown-98-139-199-x.yahoo.com
98.139.199.194	A	r37.ycpi.bf1.yahoo.net
98.139.199.203	A	r46.ycpi.bf1.yahoo.net
98.139.199.204	PTR	unknown-98-139-199-x.yahoo.com
98.139.199.204	A	r1.ycpi.vip.bf1.yahoo.net
98.139.199.204	A	thumbp16-bf1.mail.yahoo.com
98.139.199.205	PTR	unknown-98-139-199-x.yahoo.com
98.139.199.205	A	thumbp16-bf1.mail.yahoo.com
98.139.199.205	A	extern.yahoo.com