Robtex

Up: 72.30.0.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 72.30.16.0/21
Down right: 72.30.24.0/21

IP	Type	Hostname
72.30.16.157	A	sync400008-1.mail.bf1.yahoo.com
72.30.17.41	A	sync400079-2.mail.bf1.yahoo.com
72.30.17.101	A	idpproxy-dmsw1-4765.idp.inktomisearch.com
72.30.21.35	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.35	A	sk1ugadm1002.yst.yahoo.net
72.30.21.49	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.49	A	ug359702.yst.yahoo.net
72.30.21.60	A	ug317023.yst.yahoo.net
72.30.21.71	A	r301001.inktomisearch.com
72.30.21.80	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.81	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.82	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.99	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.100	A	ldbdev1.inktomisearch.com
72.30.21.102	A	r301002.inktomisearch.com
72.30.21.115	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.117	A	urldb1000vip.inktomisearch.com
72.30.21.118	A	urldb1001vip.inktomisearch.com
72.30.21.128	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.157	A	httpproxy-sk1.idp.inktomisearch.com
72.30.21.158	A	httpproxy-sk1.idp.inktomisearch.com
72.30.21.159	A	httpproxy-sk1.idp.inktomisearch.com
72.30.21.161	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.162	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.163	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.178	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.192	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.211	PTR	unknown-72-30-21-x.yahoo.com
72.30.21.225	PTR	unknown-72-30-21-x.yahoo.com
72.30.22.3	A+PTR	po7-fab2-1-gdc.bf1.yahoo.com
72.30.22.36	A	ae10.clr2-a-gdc.bf1.yahoo.com
72.30.22.232	A	athens.zts.g04.yahoodns.net
72.30.24.1	A	lo0.egr2-2-pdb.bf1.yahoo.com
72.30.24.2	A	lo0.egr3-3-pdb.bf1.yahoo.com
72.30.24.9	A	lo0.usw2-10-pdb.bf1.yahoo.com
72.30.24.90	A	lo0.tor31-91-pdb.bf1.yahoo.com
72.30.24.112	A	lo0.tor55-113-pdb.bf1.yahoo.com
72.30.24.139	A	lo0.tor82-140-pdb.bf1.yahoo.com
72.30.24.188	A	lo0.tor133-189-pdb.bf1.yahoo.com
72.30.25.11	A	lo0.tor216-268-pdb.bf1.yahoo.com
72.30.25.41	A	lo0.tor247-298-pdb.bf1.yahoo.com
72.30.25.45	A	lo0.tor251-302-pdb.bf1.yahoo.com
72.30.25.65	A	lo0.tor284-322-pdb.bf1.yahoo.com
72.30.25.86	A	lo0.tor306-343-pdb.bf1.yahoo.com
72.30.25.110	A	lo0.tor329-367-pdb.bf1.yahoo.com
72.30.25.127	A	lo0.tor347-384-pdb.bf1.yahoo.com
72.30.25.180	A	lo0.tor383-437-pdb.bf1.yahoo.com
72.30.26.17	PTR	unknown-72-30-26-x.yahoo.com
72.30.27.1	A	dns1.aol.com
72.30.28.0	PTR	unknown-72-30-28-x.yahoo.com
72.30.28.29	A	bf1liveint02.atlas.cdn.bf1.yahoo.com
72.30.28.37	A	smtp418.mail.bf1.yahoo.com
72.30.28.47	A	smtp421.mail.bf1.yahoo.com
72.30.28.48	A+PTR	smtpgate102.mob.mail.bf1.yahoo.com
72.30.28.108	A	bf1liveint01.atlas.cdn.bf1.yahoo.com
72.30.28.110	A	smtpgate101.mob.mail.bf1.yahoo.com
72.30.28.112	PTR	idpproxy-bling1-cve90m.idp.inktomisearch.com
72.30.28.112	A	smtp417.mail.bf1.yahoo.com
72.30.28.114	A	smtp419.mail.bf1.yahoo.com
72.30.28.115	A+PTR	docker-ats-02.infra.bf1.yahoo.com
72.30.28.117	A	a08.ue.bf1.yahoo.net
72.30.28.128	PTR	unknown-72-30-28-x.yahoo.com
72.30.28.129	PTR	vl-120.tor41-45-pda.bf1.yahoo.com
72.30.28.130	A+PTR	yadbuilder1.prod.manhattan.bf1.yahoo.com
72.30.28.131	PTR	iab0402410000.ostk.bm.bf1.yahoo.com
72.30.28.137	A	137.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.138	A	138.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.141	A	141.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.144	PTR	ats29.member.bf1.yahoo.com
72.30.28.145	PTR	ats30.member.bf1.yahoo.com
72.30.28.146	PTR	637076.ostk.bm2.prod.bf1.yahoo.com
72.30.28.147	A+PTR	636947.ostk.bm2.prod.bf1.yahoo.com
72.30.28.149	A	ats20.member.bf1.yahoo.com
72.30.28.152	A	152.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.153	A	153.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.160	PTR	beacon10.vpg.bf1.yahoo.com
72.30.28.161	A+PTR	734731.ostk.bm2.prod.bf1.yahoo.com
72.30.28.162	A+PTR	beacon11.vpg.bf1.yahoo.com
72.30.28.163	A+PTR	ats28.member.bf1.yahoo.com
72.30.28.165	A	17491494.ostk.bm2.prod.bf1.yahoo.com
72.30.28.176	A+PTR	bf1-sdarlaws-006.adx.bf1.yahoo.com
72.30.28.177	A+PTR	bf1-sdarlaws-014.adx.bf1.yahoo.com
72.30.28.178	PTR	bf1-sdarlaws-029.adx.bf1.yahoo.com
72.30.28.179	PTR	712952.ostk.bm2.prod.bf1.yahoo.com
72.30.28.183	A	zt09443.ostk.bm2.prod.bf1.yahoo.com
72.30.28.190	A	client400006c.mail.bf1.yahoo.com
72.30.28.192	PTR	unknown-72-30-28-x.yahoo.com
72.30.28.193	A+PTR	vl-120.tor42-46-pda.bf1.yahoo.com
72.30.28.194	PTR	860998.ostk.bm1.prod.bf1.yahoo.com
72.30.28.195	PTR	633832.ostk.bm1.prod.bf1.yahoo.com
72.30.28.204	A	204.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.207	A	207.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.208	A+PTR	ats13.member.bf1.yahoo.com
72.30.28.209	A+PTR	ats14.member.bf1.yahoo.com
72.30.28.210	A+PTR	636807.ostk.bm2.prod.bf1.yahoo.com
72.30.28.211	PTR	unknown-72-30-28-x.yahoo.com
72.30.28.216	A	ats15.member.bf1.yahoo.com
72.30.28.224	PTR	224.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.225	PTR	225.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.226	PTR	226.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.227	PTR	227.28.30.72.aprez.ostk.prod.bf1.yahoo.com
72.30.28.231	A	1069404.ostk.bm2.prod.bf1.yahoo.com
72.30.28.232	A	738210.ostk.bm2.prod.bf1.yahoo.com
72.30.28.234	A	bf1-sdarlaws-012.adx.bf1.yahoo.com
72.30.28.235	A	bf1-sdarlaws-011.adx.bf1.yahoo.com
72.30.28.240	PTR	bf1-sdarlaws-010.adx.bf1.yahoo.com
72.30.28.241	PTR	b-dna-lb1.eds.bf1.yahoo.com
72.30.28.242	PTR	beacon15.vpg.bf1.yahoo.com
72.30.28.243	A+PTR	708458.ostk.bm2.prod.bf1.yahoo.com
72.30.28.250	A	a63.ue.bf1.yahoo.net
72.30.28.254	A	a61.ue.bf1.yahoo.net
72.30.29.162	A	fan-draft144.sports.bf1.yahoo.com
72.30.29.163	A	fan-draft125.sports.bf1.yahoo.com
72.30.29.164	A	fan-draft105.sports.bf1.yahoo.com
72.30.29.164	A	fan-draft105-east.stream.sports.yahoo.com
72.30.29.177	A	fan-draft147.sports.bf1.yahoo.com
72.30.29.179	PTR	unknown-72-30-29-x.yahoo.com
72.30.29.182	A	fan-draft141.sports.bf1.yahoo.com
72.30.29.183	A	fan-draft107.sports.bf1.yahoo.com
72.30.29.184	A	fan-draft129.sports.bf1.yahoo.com
72.30.29.197	A	proxy1.yoscs.bf1.yahoo.com
72.30.30.14	A	q11.ycpi.bf1.yahoo.net
72.30.31.185	A	sync400036.mail.bf1.yahoo.com