Robtex

Up: 74.6.136.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 74.6.140.0/23
Down right: 74.6.142.0/23
(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
74.6.140.36	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
74.6.141.27	PTR	unknown.yahoo.com
74.6.141.28	A+PTR	sky400-aol-pri.mail.vip.bf2.yahoo.com
74.6.141.28	A	internal-aol.imap.mail.g03.yahoodns.net
74.6.141.34	PTR	ng14-vm2.bullet.mail.sk1.yahoo.com
74.6.141.34	A	gateway.a03.yahoodns.net
74.6.141.34	A	gw2.iris.vip.bf1.yahoo.com
74.6.141.39	PTR	ng15-vm3.bullet.mail.sk1.yahoo.com
74.6.141.39	A	railsplitter.flurry.vip.bf2.yahoo.com
74.6.141.40	PTR	unknown.yahoo.com
74.6.141.40	A	mx-aol.mail.gm0.yahoodns.net
74.6.141.40	A	mta-v2.aol.mail.vip.bf1.yahoo.com
74.6.141.41	A+PTR	ng16-vm1.bullet.mail.sk1.yahoo.com
74.6.141.43	PTR	smtp.mail.vip.bf1.yahoo.com
74.6.141.43	A	ng16-vm3.bullet.mail.sk1.yahoo.com
74.6.141.44	A+PTR	smtp.vzn.mail.vip.bf1.yahoo.com
74.6.141.44	A	ng17-vm0.bullet.mail.sk1.yahoo.com
74.6.141.44	A	smtp.verizon.g03.yahoodns.net
74.6.141.45	A+PTR	smtp.att.mail.vip.bf1.yahoo.com
74.6.141.46	PTR	ng17-vm2.bullet.mail.sk1.yahoo.com
74.6.141.50	A+PTR	smtp.aol.mail.vip.bf1.yahoo.com
74.6.141.50	A	smtp.aol.g03.yahoodns.net
74.6.141.51	A+PTR	smtp.star.mail.vip.bf1.yahoo.com
74.6.141.51	A	star.smtp.mail.global.gm0.yahoodns.net
74.6.141.53	A+PTR	ng19-vm1.bullet.mail.sk1.yahoo.com
74.6.141.54	A+PTR	ng19-vm2.bullet.mail.sk1.yahoo.com
74.6.141.56	A+PTR	ng20-vm0.bullet.mail.sk1.yahoo.com
74.6.141.57	A	ng20-vm1.bullet.mail.sk1.yahoo.com
74.6.141.58	A+PTR	ng20-vm2.bullet.mail.sk1.yahoo.com
74.6.141.64	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.72	A	ng2-vm0.bullet.mail.sk1.yahoo.com
74.6.141.74	A+PTR	ng2-vm2.bullet.mail.sk1.yahoo.com
74.6.141.76	A+PTR	ng3-vm0.bullet.mail.sk1.yahoo.com
74.6.141.77	A	ng3-vm1.bullet.mail.sk1.yahoo.com
74.6.141.81	A	ng6-vm1.bullet.mail.sk1.yahoo.com
74.6.141.83	A+PTR	ng6-vm3.bullet.mail.sk1.yahoo.com
74.6.141.133	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.133	A	c3560-g48.sk1.yahoo.com
74.6.141.141	A+PTR	ng5-vm1.bullet.mail.sk1.yahoo.com
74.6.141.146	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.146	A	ng10-vm2.bullet.mail.sk1.yahoo.com
74.6.141.148	A	ng11-vm0.bullet.mail.sk1.yahoo.com
74.6.141.165	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.173	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.180	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.197	A+PTR	c3560-g49.sk1.yahoo.com
74.6.141.208	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.208	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.209	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.209	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.210	PTR	unknown.yahoo.com
74.6.141.210	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.211	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.211	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.212	A+PTR	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.213	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.213	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.214	A+PTR	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.215	PTR	unknown.yahoo.com
74.6.141.215	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.216	PTR	unknown.yahoo.com
74.6.141.216	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.217	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.217	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.218	A+PTR	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.219	A+PTR	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.220	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.220	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.221	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.221	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.222	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.222	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.223	PTR	unknown-74-6-141-x.yahoo.com
74.6.141.223	A	newman2.bullet.10025.mail.dns.sk1.yahoo.com
74.6.141.253	PTR	unknown-74-6-141-x.yahoo.com
74.6.142.10	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.14	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.15	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.32	PTR	vespa-rtc0111.shop.vis.sk1.yahoo.com
74.6.142.50	A	vespa-rtc0129.shop.vis.sk1.yahoo.com
74.6.142.52	A	vespa-rtc0131.shop.vis.sk1.yahoo.com
74.6.142.61	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.64	PTR	prd.gossip.search.vip.sk1.yahoo.com
74.6.142.73	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.77	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.100	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.112	A	inv17.2n.q4.inv.search.sk1.yahoo.com
74.6.142.113	A	inv18.2n.q4.inv.search.sk1.yahoo.com
74.6.142.116	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.116	A	inv21.2n.q4.inv.search.sk1.yahoo.com
74.6.142.161	A+PTR	inv02.2p.q4.inv.search.sk1.yahoo.com
74.6.142.164	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.166	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.166	A	inv07.2p.q4.inv.search.sk1.yahoo.com
74.6.142.167	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.170	A	inv11.2p.q4.inv.search.sk1.yahoo.com
74.6.142.189	PTR	inv30.2p.q4.inv.search.sk1.yahoo.com
74.6.142.198	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.202	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.215	PTR	unknown-74-6-142-x.yahoo.com
74.6.142.242	PTR	unknown-74-6-142-x.yahoo.com
74.6.143.6	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.8	PTR	unknown.yahoo.com
74.6.143.8	A	media-router-flurry2.prod.media.vip.bf1.yahoo.com
74.6.143.10	PTR	unknown.yahoo.com
74.6.143.10	A	ycpproxy-ingress.psi.vip.bf1.yahoo.com
74.6.143.11	A	ui-ingress.psi.vip.bf1.yahoo.com
74.6.143.14	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.14	A	mpr2.ngd.vip.bf1.yahoo.com
74.6.143.18	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.18	A	yho.com
74.6.143.18	A	yahoo.co.uk
74.6.143.19	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.21	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.22	PTR	media-router-api71.prod.media.vip.bf1.yahoo.com
74.6.143.22	A	ncp-gw-sports.g03.yahoodns.net
74.6.143.25	PTR	media-router-fp73.prod.media.vip.bf1.yahoo.com
74.6.143.25	A	yahoo.com
74.6.143.25	A	atsv2-fp.wg1.b.yahoo.com
74.6.143.26	PTR	media-router-fp74.prod.media.vip.bf1.yahoo.com
74.6.143.26	A	yahoo.com
74.6.143.26	A	atsv2-fp.wg1.b.yahoo.com
74.6.143.27	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.28	A+PTR	vespa-feeder7.shop.vis.sk1.yahoo.com
74.6.143.38	PTR	vespa-rtc0071.shop.vis.sk1.yahoo.com
74.6.143.62	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.66	PTR	unknown.yahoo.com
74.6.143.66	A	vespa-rtc0003.shop.vis.sk1.yahoo.com
74.6.143.71	A	vespa-rtc0008.shop.vis.sk1.yahoo.com
74.6.143.77	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.83	PTR	vespa-rtc0020.shop.vis.sk1.yahoo.com
74.6.143.96	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.99	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.102	A+PTR	vespa-rtc0039.shop.vis.sk1.yahoo.com
74.6.143.110	PTR	vespa-rtc0047.shop.vis.sk1.yahoo.com
74.6.143.140	A+PTR	vespa-rtc0105.shop.vis.sk1.yahoo.com
74.6.143.143	PTR	unknown.yahoo.com
74.6.143.172	PTR	unknown-74-6-143-x.yahoo.com
74.6.143.193	PTR	unknown.yahoo.com
74.6.143.226	PTR	unknown-74-6-143-x.yahoo.com