Robtex

Up: 76.13.0.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 76.13.0.0/19
Down right: 76.13.32.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
76.13.0.0	PTR	unknown.yahoo.com
76.13.0.7	A	rsw5-2-flk.bf1.yahoo.com
76.13.0.248	A	bas-c2.ac4.yahoo.com
76.13.1.1	A	lo0.bas1-2-flk.bf1.yahoo.com
76.13.1.175	A	bas-g8.ac4.yahoo.com
76.13.1.189	A	bas2-1-yst.ac4.yahoo.com
76.13.2.0	PTR	unknown-76-13-2-x.yahoo.com
76.13.2.23	A	te-9-3.bas-f2.ac2.yahoo.com
76.13.6.31	A	bs2.ads.vip.ac4.yahoo.com
76.13.6.190	A	fe.secure.del.vip.ac4.yahoo.net
76.13.10.159	A	f6122.mail.vip.ac4.yahoo.com
76.13.10.237	A	f6123.mail.yahoo.com
76.13.10.237	A	f6123.mail.vip.ac4.yahoo.com
76.13.12.108	A	f594.mail.vip.ac4.yahoo.com
76.13.13.1	PTR	unknown-76-13-13-x.yahoo.com
76.13.13.67	PTR	unknown-76-13-13-x.yahoo.com
76.13.13.72	A	n2b.bullet.mail.ac4.yahoo.com
76.13.13.75	A	n5b.bullet.mail.ac4.yahoo.com
76.13.13.77	A	n7b.bullet.mail.ac4.yahoo.com
76.13.13.78	A	n1c.bullet.mail.ac4.yahoo.com
76.13.13.144	A	spitfire.mail.yahoo.com
76.13.13.150	A	imap-us.mail.yahoo.com
76.13.13.246	A	smtp120.rog.mail.ac4.yahoo.com
76.13.15.1	PTR	unknown-76-13-15-x.yahoo.com
76.13.15.42	A	el111.msg.ac4.yahoo.com
76.13.15.46	A	el115.msg.ac4.yahoo.com
76.13.16.12	A	c4948-b3.ac4.yahoo.com
76.13.16.26	A	c4948-b13.ac4.yahoo.com
76.13.17.5	A	si-b1.vl220.ac4.yahoo.com
76.13.17.7	A	bw21.finance.ac4.yahoo.com
76.13.17.39	A	old.news.yahoo.com
76.13.17.39	A	api.news.yahoo.com
76.13.17.71	A	ct4.ycs.ac4.yahoo.net
76.13.17.130	A+PTR	ct02.rm.ac4.yahoo.com
76.13.17.180	A	rptprod20.rm.ac4.yahoo.com
76.13.17.254	A	static.vap.yahoo.net
76.13.18.77	A	storage4-dsr.flickr.vip.ac4.yahoo.com
76.13.18.79	A	storage5.flickr.vip.ac4.yahoo.com
76.13.21.33	A	relay2.voice.ac4.yahoo.com
76.13.23.51	A	tax-evasion-bank-fraud.adrevolver.com
76.13.23.51	A	adrevolver.com
76.13.23.51	A	media-adrevolver.bl.vip.ac4.yahoo.net
76.13.26.64	PTR	sendmailws141.mail.bf1.yahoo.com
76.13.26.65	PTR	hs10420.mail.bf1.yahoo.com
76.13.26.66	PTR	hs10418.mail.bf1.yahoo.com
76.13.26.127	A	sendmailws115.mail.bf1.yahoo.com
76.13.26.136	A	sendmailws131.mail.bf1.yahoo.com
76.13.26.172	A	mg1013.mail.bf1.yahoo.com
76.13.26.237	A	mg1046.mail.bf1.yahoo.com
76.13.27.6	A	sendmailws120.mail.bf1.yahoo.com
76.13.27.34	A	sendmailws127.mail.bf1.yahoo.com
76.13.27.35	A	sendmailws128.mail.bf1.yahoo.com
76.13.27.48	A	sendmailws133.mail.bf1.yahoo.com
76.13.27.69	A	sendmailws122.mail.bf1.yahoo.com
76.13.27.132	A	sendmailws137.mail.bf1.yahoo.com
76.13.27.197	A	sendmailws140.mail.bf1.yahoo.com
76.13.28.0	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.1	A+PTR	ha1.vl-122.usw5-29-pdb.bf1.yahoo.com
76.13.28.3	A	vl-122.usw5-29-pdb.bf1.yahoo.com
76.13.28.4	A	vl-122.usw6-45-pdb.bf1.yahoo.com
76.13.28.7	A	media-router-flurry2.prod.media.wg1.b.yahoo.com
76.13.28.65	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.65	A	y.it.a03.yahoodns.net
76.13.28.67	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.69	A	master.ue.aycpi.b.yahoodns.net
76.13.28.69	A	master.ue.vip.bf1.yahoo.net
76.13.28.70	A	csc.beap.ad.yieldmanager.net
76.13.28.128	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.130	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.132	A	serf.ue.vip.bf1.yahoo.net
76.13.28.194	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.195	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.196	A	cooliris.com
76.13.28.196	A	emea.adspecs.yahoo.com
76.13.28.196	A	prod-intels-myc.g03.yahoodns.net
76.13.29.174	A	ws170.progrss.bf1.yahoo.com
76.13.29.176	A	ws101.progrss.bf1.yahoo.com
76.13.29.212	A	bf1-1scheduler-003.adx.bf1.yahoo.com
76.13.30.18	A	bf1-uaddbcx-001.data.bf1.yahoo.com
76.13.30.19	A	bf1-uaddbcx-002.data.bf1.yahoo.com
76.13.31.33	A	aptspare-002.adx.bf1.yahoo.com
76.13.32.42	A	smtp-mob.biz.mail.global.gm0.yahoodns.net
76.13.32.136	A	media-router-apple2.prod.media.vip.bf1.yahoo.com
76.13.32.146	A	spdc.pbp.vip.bf1.yahoo.com
76.13.32.147	A	spcms.pbp.vip.bf1.yahoo.com
76.13.32.147	A	spcms-global.pbp.gysm.yahoodns.net
76.13.34.6	A	usw2-1-e.yahoo.com
76.13.34.25	A	srv.ysm.vip.ac4.yahoo.com
76.13.34.26	A	cmls.eu.overture.com
76.13.34.26	A	cmls.overture.com
76.13.37.65	PTR	unknown-76-13-37-x.yahoo.com
76.13.37.66	PTR	unknown-76-13-37-x.yahoo.com
76.13.37.194	PTR	unknown-76-13-37-x.yahoo.com
76.13.38.1	PTR	unknown-76-13-38-x.yahoo.com
76.13.40.65	PTR	unknown-76-13-40-x.yahoo.com
76.13.42.193	PTR	unknown-76-13-42-x.yahoo.com
76.13.43.3	PTR	unknown-76-13-43-x.yahoo.com
76.13.44.3	PTR	unknown-76-13-44-x.yahoo.com
76.13.44.193	PTR	unknown-76-13-44-x.yahoo.com
76.13.47.130	PTR	unknown-76-13-47-x.yahoo.com
76.13.57.0	PTR	unknown-76-13-57-x.yahoo.com
76.13.57.65	PTR	unknown-76-13-57-x.yahoo.com
76.13.62.84	A	a323.yahoofs.a00.yahoodns.net
76.13.62.95	A	a367.yahoofs.com
76.13.62.95	A	a367.yahoofs.a00.yahoodns.net
76.13.63.61	A	fe1.shine.lifestyles.fy11.b.yahoo.com