Robtex

Up: 209.73.160.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 209.73.160.0/21
Down right: 209.73.168.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
209.73.160.0	PTR	unknown-209-73-160-x.yahoo.com
209.73.160.146	PTR	unknown-209-73-160-x.yahoo.com
209.73.161.130	PTR	unknown-209-73-161-x.yahoo.com
209.73.161.146	PTR	unknown-209-73-161-x.yahoo.com
209.73.161.210	PTR	unknown-209-73-161-x.yahoo.com
209.73.162.32	A	eu1-jail1.bill.snv.yahoo.com
209.73.162.80	PTR	unknown-209-73-162-x.yahoo.com
209.73.164.5	A	rsw65-3-apx.ac4.yahoo.com
209.73.164.17	A	ac4-bcpstats-007.ysm.ac4.yahoo.com
209.73.164.34	A	ns-admin.altavista.es
209.73.164.49	A	a19.cl2.ads.adx.ac4.yahoo.com
209.73.164.53	A	tmpac4-bcpstats-007.ysm.ac4.yahoo.com
209.73.164.81	A+PTR	mail1.sv.av.com
209.73.164.82	A+PTR	mail2.sv.av.com
209.73.164.85	A	mail10.sv.av.com
209.73.164.97	A	av-vip8.sv.av.com
209.73.164.99	PTR	av-vip10.sv.av.com
209.73.164.121	A	wireless.altavista.com
209.73.164.131	A	po-167.bas1-3-apx.ac4.yahoo.com
209.73.164.151	A	thumbnail.altavista.com
209.73.164.204	A	dhcp-164-204.av.com
209.73.164.205	A	dhcp-164-205.av.com
209.73.164.206	A	dhcp-164-206.av.com
209.73.164.208	A+PTR	dhcp-164-208.av.com
209.73.164.209	A	dhcp-164-209.av.com
209.73.164.222	A	monitor.altavista.com
209.73.164.230	A	bigip1a.sv.av.com
209.73.165.19	PTR	unknown-209-73-165-x.yahoo.com
209.73.165.160	PTR	unknown-209-73-165-x.yahoo.com
209.73.165.225	PTR	unknown-209-73-165-x.yahoo.com
209.73.166.38	A	ac4-campuploader-003.ysm.ac4.yahoo.com
209.73.167.129	PTR	unknown-209-73-167-x.yahoo.com
209.73.168.35	PTR	apgvm71.adx.pool.ac4.yahoo.com
209.73.168.145	PTR	unknown-209-73-168-x.yahoo.com
209.73.169.146	PTR	unknown-209-73-169-x.yahoo.com
209.73.169.176	PTR	unknown-209-73-169-x.yahoo.com
209.73.169.177	A	zeta.news.yahoo.com
209.73.170.2	PTR	ha2.po-134.bas-5-apx.ac4.yahoo.com
209.73.170.3	PTR	unknown-209-73-170-x.yahoo.com
209.73.170.5	A	rsw34-5-apx.ac4.yahoo.com
209.73.170.17	PTR	apgvm38.adx.pool.ac4.yahoo.com
209.73.170.23	A	newmonix.com
209.73.170.23	A	ac4-r3qaadtscorfe-002.ysm.pool.ac4.yahoo.com
209.73.170.23	A	saproxy.com
209.73.170.49	PTR	unknown-209-73-170-x.yahoo.com
209.73.170.80	PTR	unknown-209-73-170-x.yahoo.com
209.73.170.130	PTR	unknown-209-73-170-x.yahoo.com
209.73.170.178	A+PTR	tbs1.ads.yahoo.com
209.73.170.179	PTR	tbs2.ads.yahoo.com
209.73.170.181	A	tcs1.ads.yahoo.com
209.73.170.182	A	tcs2.ads.yahoo.com
209.73.170.200	A	ac4-r3qaadtscorfe-004.ysm.pool.ac4.yahoo.com
209.73.170.238	A	ac4-jagint-014.adx.pool.ac4.yahoo.com
209.73.170.242	PTR	unknown-209-73-170-x.yahoo.com
209.73.170.247	A	dataintake-5.adx.pool.ac4.yahoo.com
209.73.172.14	A	nvs3.disaster.yahoo.com
209.73.172.18	PTR	unknown-209-73-172-x.yahoo.com
209.73.175.16	PTR	unknown-209-73-175-x.yahoo.com
209.73.175.115	PTR	ri1130.yss.ac2.yahoo.com
209.73.175.154	A	certusappdev.corp.yahoo.com