Robtex

Up: 72.30.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 72.30.32.0/20
Down right: 72.30.48.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
72.30.32.0	PTR	te-8-3.bas-b1.sk1.yahoo.com
72.30.32.0	A	lo0.egr1-1-pdc.bf1.yahoo.com
72.30.32.1	A	lo0.egr2-2-pdc.bf1.yahoo.com
72.30.32.3	A	lo0.egr4-4-pdc.bf1.yahoo.com
72.30.32.4	A	lo0.usw1-5-pdc.bf1.yahoo.com
72.30.32.34	PTR	unknown.yahoo.com
72.30.32.35	PTR	unknown-72-30-32-x.yahoo.com
72.30.32.40	A	lo0.tor156-41-pdc.bf1.yahoo.com
72.30.32.43	A	lo0.tor202-44-pdc.bf1.yahoo.com
72.30.32.45	A	lo0.tor204-46-pdc.bf1.yahoo.com
72.30.32.51	A	gi-1-46.bas-f1.sk1.yahoo.com
72.30.32.64	PTR	unknown-72-30-32-x.yahoo.com
72.30.32.68	A	c4948-e1.sk1.yahoo.com
72.30.32.72	A	lo0.tor32-73-pdc.bf1.yahoo.com
72.30.32.74	A	c4948-e7.sk1.yahoo.com
72.30.32.77	A	lo0.tor37-78-pdc.bf1.yahoo.com
72.30.32.102	A	lo0.tor60-103-pdc.bf1.yahoo.com
72.30.32.104	A	lo0.tor62-105-pdc.bf1.yahoo.com
72.30.32.107	A	lo0.tor65-108-pdc.bf1.yahoo.com
72.30.32.108	A	c4948-e41.sk1.yahoo.com
72.30.32.128	PTR	unknown-72-30-32-x.yahoo.com
72.30.32.136	A	sk1-sbxarevfe-001.ysm.sk1.yahoo.com
72.30.32.142	A	sk1-sbxadservices-002.ysm.sk1.yahoo.com
72.30.32.145	A	sk1-sbxkwsrvcapi-002.ysm.sk1.yahoo.com
72.30.32.146	A	sk1-sbxam-001.ysm.sk1.yahoo.com
72.30.32.173	A	sk1-sbxsecadsrvcs-002.ysm.sk1.yahoo.com
72.30.32.181	A	lo0.tor144-182-pdc.bf1.yahoo.com
72.30.32.192	PTR	unknown-72-30-32-x.yahoo.com
72.30.32.218	A	lo0.tor187-219-pdc.bf1.yahoo.com
72.30.32.219	A	lo0.tor188-220-pdc.bf1.yahoo.com
72.30.32.224	PTR	unknown-72-30-32-x.yahoo.com
72.30.32.226	A+PTR	lo0.tor194-227-pdc.bf1.yahoo.com
72.30.32.242	A	lo0.tor233-243-pdc.bf1.yahoo.com
72.30.32.252	A	lo0.tor246-253-pdc.bf1.yahoo.com
72.30.33.10	A	lo0.tor224-267-pdc.bf1.yahoo.com
72.30.33.12	A	ctg-kingkong-service.ysm.vip.sk1.yahoo.com
72.30.33.15	A	xml.kr.yahoo-poptecl.ysm.vip.sk1.yahoo.com
72.30.33.19	A	arev.ysm.vip.sk1.yahoo.com
72.30.33.34	PTR	unknown-72-30-33-x.yahoo.com
72.30.33.53	A	data.wa.marketingsolutions.yahoo.com
72.30.33.55	A	dataov.wa.ysm.vip.sk1.yahoo.com
72.30.33.55	A	data.wa.perf.overture.com
72.30.33.58	A	lo0.tor268-315-pdc.bf1.yahoo.com
72.30.33.70	A	any-login.ysm.yahoodns.net
72.30.33.70	A	login.ysm.yahoodns.net
72.30.33.99	A	lo0.tor287-356-pdc.bf1.yahoo.com
72.30.33.101	A	rc.us-west.srv.overture.com
72.30.33.101	A	lo0.tor289-358-pdc.bf1.yahoo.com
72.30.33.101	A	any-rc.srv.ysm.yahoodns.net
72.30.33.138	A	xml.uk.lycos.ysm.vip.sk1.yahoo.com
72.30.33.239	A	login14.ysm.vip.sk1.yahoo.com
72.30.33.246	A	loginauth.gysm.yahoodns.net
72.30.33.246	A	marketingsolutions.login.yahoo.com
72.30.33.246	A	any-loginauth.ysm.yahoodns.net
72.30.34.35	A	lo0.lef20-1-pdc.bf1.yahoo.com
72.30.34.93	A	lo0.lef14-2-pdc.bf1.yahoo.com
72.30.34.130	PTR	unknown-72-30-34-x.yahoo.com
72.30.34.149	A	et3.egr3-3-pdc.bf1.yahoo.com
72.30.35.2	PTR	ha2.vl-156.bas-1-flk.bf1.yahoo.com
72.30.35.3	A+PTR	vl-156.bas1-1-flk.bf1.yahoo.com
72.30.35.4	A	vl-156.bas2-1-flk.bf1.yahoo.com
72.30.35.6	A	vl-156.slb4-1-flk.bf1.yahoo.com
72.30.35.9	A	unbsd.com
72.30.35.10	A	unbsd.com
72.30.35.32	PTR	unknown-72-30-35-x.yahoo.com
72.30.35.33	PTR	unknown-72-30-35-x.yahoo.com
72.30.35.34	PTR	unknown-72-30-35-x.yahoo.com
72.30.35.35	PTR	unknown-72-30-35-x.yahoo.com
72.30.35.41	A	whs-02.ops.bf1.yahoo.com
72.30.35.44	A	whs-03.ops.yahoo.com
72.30.35.45	A	whs-01.ops.yahoo.com
72.30.35.54	A	secops-proxy-01.ops.bf1.yahoo.com
72.30.35.64	PTR	unknown-72-30-35-x.yahoo.com
72.30.35.70	A	secops-rdp-01.ops.bf1.yahoo.com
72.30.35.81	A	ha1.vl-350.bas-1-flk.bf1.yahoo.com
72.30.35.82	A	vl-350.bas1-1-flk.bf1.yahoo.com
72.30.35.88	A	1.tandberg.pool.ntp.org
72.30.35.101	A	og01.ktc.net.bfz.yahoo.com
72.30.35.160	PTR	unknown-72-30-35-x.yahoo.com
72.30.35.162	PTR	unknown-72-30-35-x.yahoo.com
72.30.36.1	PTR	unknown-72-30-36-x.yahoo.com
72.30.36.52	A	gssp203n33.ygrid.corp.sp1.yahoo.com
72.30.36.54	A	prodtool.local.a03.yahoodns.net
72.30.36.160	A	gssp201n13.ygrid.corp.sp1.yahoo.com
72.30.36.161	PTR	unknown-72-30-36-x.yahoo.com
72.30.37.130	PTR	unknown-72-30-37-x.yahoo.com
72.30.37.194	PTR	unknown-72-30-37-x.yahoo.com
72.30.38.1	PTR	unknown-72-30-38-x.yahoo.com
72.30.38.3	PTR	unknown-72-30-38-x.yahoo.com
72.30.38.42	A	w3.fp.sp2.yahoo.com
72.30.38.45	A	w6.fp.sp2.yahoo.com
72.30.38.46	A	w7.fp.sp2.yahoo.com
72.30.38.75	A	w31.fp.sp2.yahoo.com
72.30.38.77	A	w33.fp.sp2.yahoo.com
72.30.38.83	A	w39.fp.sp2.yahoo.com
72.30.38.100	A	w56.fp.sp2.yahoo.com
72.30.38.140	A	15m.yuhoo.nl
72.30.38.140	A	faculty.harvard1.net
72.30.38.140	A	maproconstructions.com
72.30.38.194	PTR	hsrp1.g-2-13.bas-b1.sk1.yahoo.com
72.30.38.195	PTR	g-2-13.bas-b1.sk1.yahoo.com
72.30.38.197	A	testservice1.psi.bf1.yahoo.com
72.30.38.230	A	ir9.fp.sp2.yahoo.com
72.30.38.233	A	ir12.fp.sp2.yahoo.com
72.30.39.33	PTR	gd1817.adx.sp2.yahoo.com
72.30.39.69	A	rsw82-1-apx.sp2.yahoo.com
72.30.39.84	A	oxy-oxygen-481e2754.bf1.yahoo.com
72.30.39.103	A	sp2-soomon-001.adx.sp2.yahoo.com
72.30.39.195	PTR	unknown-72-30-39-x.yahoo.com
72.30.39.235	A	jagmyna312.adx.sp2.yahoo.com
72.30.41.1	PTR	unknown-72-30-41-x.yahoo.com
72.30.44.0	A	lo0.egr1-1-pdd.bf1.yahoo.com
72.30.44.3	A	lo0.egr4-4-pdd.bf1.yahoo.com
72.30.44.64	PTR	unknown-72-30-44-x.yahoo.com
72.30.44.131	PTR	unknown-72-30-44-x.yahoo.com
72.30.53.163	PTR	unknown-72-30-53-x.yahoo.com
72.30.54.67	A+PTR	po-75.bas-b1.sk1.yahoo.com
72.30.60.2	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.2	A	ha2.po-18.bas-d.sk1.yahoo.com
72.30.60.3	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.35	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.65	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.66	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.77	A	ui-26.roles.bf1.yahoo.com
72.30.60.96	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.97	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.160	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.162	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.192	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.194	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.216	A	ui-05.roles.bf1.yahoo.com
72.30.60.225	PTR	unknown-72-30-60-x.yahoo.com
72.30.60.227	PTR	unknown-72-30-60-x.yahoo.com
72.30.62.85	A	pud5058.udb.bf1.yahoo.com
72.30.63.129	PTR	ha1.po-32.bas-d.sk1.yahoo.com
72.30.63.206	A	idx20.splunk.udb.bf1.yahoo.com