Robtex

Up: 76.13.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 76.13.16.0/21
Down right: 76.13.24.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
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
76.13.17.16	PTR	unknown-76-13-17-x.yahoo.com
76.13.17.19	PTR	unknown-76-13-17-x.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
76.13.20.16	PTR	unknown-76-13-20-x.yahoo.com
76.13.21.17	PTR	unknown-76-13-21-x.yahoo.com
76.13.21.33	PTR	unknown-76-13-21-x.yahoo.com
76.13.21.33	A	relay2.voice.ac4.yahoo.com
76.13.23.51	A+PTR	media-adrevolver.bl.vip.ac4.yahoo.net
76.13.23.51	A	tax-evasion-bank-fraud.adrevolver.com
76.13.23.51	A	adrevolver.com
76.13.24.33	PTR	unknown-76-13-24-x.yahoo.com
76.13.24.99	PTR	unknown-76-13-24-x.yahoo.com
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
76.13.26.226	PTR	unknown-76-13-26-x.yahoo.com
76.13.26.237	A	mg1046.mail.bf1.yahoo.com
76.13.26.240	PTR	mg1049.mail.bf1.yahoo.com
76.13.27.6	A	sendmailws120.mail.bf1.yahoo.com
76.13.27.34	A+PTR	sendmailws127.mail.bf1.yahoo.com
76.13.27.35	A+PTR	sendmailws128.mail.bf1.yahoo.com
76.13.27.48	A+PTR	sendmailws133.mail.bf1.yahoo.com
76.13.27.49	A+PTR	sendmailws134.mail.bf1.yahoo.com
76.13.27.50	PTR	sendmailws121.mail.bf1.yahoo.com
76.13.27.54	A	sendmailws135.mail.bf1.yahoo.com
76.13.27.69	A	sendmailws122.mail.bf1.yahoo.com
76.13.27.113	PTR	unknown-76-13-27-x.yahoo.com
76.13.27.114	PTR	unknown-76-13-27-x.yahoo.com
76.13.27.132	A	sendmailws137.mail.bf1.yahoo.com
76.13.27.147	PTR	unknown-76-13-27-x.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
76.13.28.19	PTR	sendmailws-v1.mail.vip.bf1.yahoo.com
76.13.28.21	A	av-beap.adx.vip.bf1.yahoo.com
76.13.28.21	A	beapav.bc.gysm.yahoodns.net
76.13.28.21	A	us-beapav.bc.gysm.yahoodns.net
76.13.28.23	A	x-master.ue.vip.bf1.yahoo.net
76.13.28.33	A+PTR	test2-hc-rm.sutha.netops.vip.bf1.yahoo.com
76.13.28.34	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.49	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.50	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.51	PTR	unknown-76-13-28-x.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
76.13.28.82	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.83	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.96	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.97	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.113	PTR	unknown-76-13-28-x.yahoo.com
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
76.13.28.144	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.145	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.146	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.147	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.161	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.163	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.178	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.179	PTR	unknown-76-13-28-x.yahoo.com
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
76.13.28.209	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.240	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.241	PTR	unknown-76-13-28-x.yahoo.com
76.13.28.243	PTR	unknown-76-13-28-x.yahoo.com
76.13.29.174	A	ws170.progrss.bf1.yahoo.com
76.13.29.176	A+PTR	ws101.progrss.bf1.yahoo.com
76.13.29.212	A	bf1-1scheduler-003.adx.bf1.yahoo.com
76.13.29.241	PTR	unknown-76-13-29-x.yahoo.com
76.13.30.18	A+PTR	bf1-uaddbcx-001.data.bf1.yahoo.com
76.13.30.19	A+PTR	bf1-uaddbcx-002.data.bf1.yahoo.com
76.13.31.33	A	aptspare-002.adx.bf1.yahoo.com