Robtex

Up: 74.6.160.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 74.6.168.0/22
Down right: 74.6.172.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
74.6.168.16	PTR	unknown-74-6-168-x.yahoo.com
74.6.168.18	PTR	unknown-74-6-168-x.yahoo.com
74.6.168.18	A	dqa-cli100.dht.gq1.yahoo.com
74.6.168.34	PTR	unknown-74-6-168-x.yahoo.com
74.6.168.72	A+PTR	t1.time.gq1.yahoo.com
74.6.168.72	A	0.centos.pool.ntp.org
74.6.168.72	A	0.pool.ntp.org
74.6.168.73	PTR	t2.time.gq1.yahoo.com
74.6.168.97	PTR	unknown-74-6-168-x.yahoo.com
74.6.168.99	PTR	unknown-74-6-168-x.yahoo.com
74.6.168.148	A	g1107.crawl.yahoo.net
74.6.168.163	A+PTR	g1092.crawl.yahoo.net
74.6.168.213	A	g1042.crawl.yahoo.net
74.6.168.217	A+PTR	g1038.crawl.yahoo.net
74.6.168.242	A+PTR	g1013.crawl.yahoo.net
74.6.169.9	PTR	unknown-74-6-169-x.yahoo.com
74.6.169.11	PTR	unknown-74-6-169-x.yahoo.com
74.6.169.25	PTR	unknown-74-6-169-x.yahoo.com
74.6.169.51	PTR	unknown-74-6-169-x.yahoo.com
74.6.169.74	PTR	unknown-74-6-169-x.yahoo.com
74.6.169.89	PTR	unknown-74-6-169-x.yahoo.com
74.6.169.114	PTR	unknown-74-6-169-x.yahoo.com
74.6.169.168	PTR	unknown-74-6-169-x.yahoo.com
74.6.169.195	PTR	unknown-74-6-169-x.yahoo.com
74.6.169.248	PTR	unknown-74-6-169-x.yahoo.com
74.6.169.250	PTR	unknown-74-6-169-x.yahoo.com
74.6.170.11	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.24	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.43	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.64	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.73	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.74	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.89	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.146	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.147	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.168	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.177	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.186	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.192	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.194	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.201	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.203	PTR	unknown-74-6-170-x.yahoo.com
74.6.170.232	PTR	unknown-74-6-170-x.yahoo.com
74.6.171.19	PTR	unknown-74-6-171-x.yahoo.com
74.6.171.56	PTR	unknown-74-6-171-x.yahoo.com
74.6.171.107	PTR	unknown-74-6-171-x.yahoo.com
74.6.171.185	PTR	unknown-74-6-171-x.yahoo.com
74.6.172.2	PTR	unknown-74-6-172-x.yahoo.com
74.6.172.34	PTR	unknown-74-6-172-x.yahoo.com
74.6.172.88	PTR	unknown-74-6-172-x.yahoo.com
74.6.172.104	PTR	unknown-74-6-172-x.yahoo.com
74.6.172.105	PTR	unknown-74-6-172-x.yahoo.com
74.6.172.123	PTR	unknown-74-6-172-x.yahoo.com
74.6.172.216	PTR	unknown-74-6-172-x.yahoo.com
74.6.172.234	PTR	unknown-74-6-172-x.yahoo.com
74.6.172.243	PTR	unknown-74-6-172-x.yahoo.com
74.6.173.2	PTR	ha2.gi-11-14.bas-1-yst.cc1.yahoo.com
74.6.173.9	PTR	unknown-74-6-173-x.yahoo.com
74.6.173.72	PTR	gi-11-15.bas4-1-yst.cc1.yahoo.com
74.6.173.80	PTR	unknown-74-6-173-x.yahoo.com
74.6.173.96	PTR	unknown-74-6-173-x.yahoo.com
74.6.173.113	PTR	unknown-74-6-173-x.yahoo.com
74.6.173.154	PTR	unknown-74-6-173-x.yahoo.com
74.6.173.163	PTR	unknown-74-6-173-x.yahoo.com
74.6.173.225	PTR	unknown-74-6-173-x.yahoo.com
74.6.174.17	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.19	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.27	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.32	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.34	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.48	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.49	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.51	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.64	A+PTR	lo0.spn1-2-sea.gq1.yahoo.com
74.6.174.65	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.98	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.115	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.163	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.177	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.216	PTR	unknown-74-6-174-x.yahoo.com
74.6.174.227	PTR	unknown-74-6-174-x.yahoo.com
74.6.175.8	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.9	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.11	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.27	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.33	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.50	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.75	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.82	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.91	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.98	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.130	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.153	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.169	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.224	PTR	unknown-74-6-175-x.yahoo.com
74.6.175.233	PTR	unknown-74-6-175-x.yahoo.com