Robtex

Up: 74.6.140.0/23
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Down left: 74.6.140.0/25
Down right: 74.6.140.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
74.6.140.0	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.30	A+PTR	mxvm1.mail.yahoo.com
74.6.140.30	A	mta-v1.van.mail.vip.sk1.yahoo.com
74.6.140.30	A	mxvm3.mail.yahoo.com
74.6.140.31	PTR	et25.usw2-1-lbb.bf2.yahoo.com
74.6.140.31	A	mx.dohrnit.com
74.6.140.36	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.40	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.41	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.41	A	smtp-rog.mail.a03.yahoodns.net
74.6.140.64	A+PTR	i.mx.mail.yahoo.com
74.6.140.64	A	mta-v2.mail.vip.sk1.yahoo.com
74.6.140.73	A+PTR	n2-vm4.bullet.mail.sk1.yahoo.com
74.6.140.77	A+PTR	n2-vm5.bullet.mail.sk1.yahoo.com
74.6.140.83	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.86	A	n3-vm0.bullet.mail.sk1.yahoo.com
74.6.140.89	A	n2-vm1.bullet.mail.sk1.yahoo.com
74.6.140.91	A+PTR	n4-vm1.bullet.mail.sk1.yahoo.com
74.6.140.100	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.134	A	n3-vm3.bullet.mail.sk1.yahoo.com
74.6.140.136	PTR	unknown.yahoo.com
74.6.140.136	A	marketingpreferences.g03.yahoodns.net
74.6.140.136	A	a1.omega.tv-widgets-api.b.g03.yahoodns.net
74.6.140.138	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.145	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.145	A	mta1001.biz.mail.sk1.yahoo.com
74.6.140.200	A+PTR	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.140.201	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.201	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.140.202	A+PTR	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.140.203	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.203	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.140.231	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.248	PTR	unknown-74-6-140-x.yahoo.com
74.6.140.250	A+PTR	rmpu03.asd.mail.sk1.yahoo.com