Robtex

Up: 217.146.176.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 217.146.176.0/22
Down right: 217.146.180.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
217.146.176.0	PTR	unknown.yahoo.com
217.146.176.19	PTR	unknown-217-146-176-x.yahoo.com
217.146.176.137	PTR	ha13-mail.dns.ir2.yahoo.com
217.146.176.138	PTR	ha14-mail.dns.ir2.yahoo.com
217.146.176.168	PTR	unknown-217-146-176-x.yahoo.com
217.146.176.205	A	i102.crawl.yahoo.net
217.146.176.233	PTR	unknown-217-146-176-x.yahoo.com
217.146.176.248	PTR	unknown-217-146-176-x.yahoo.com
217.146.177.39	A	xsltm6.finance.ir2.yahoo.com
217.146.177.64	PTR	unknown-217-146-177-x.yahoo.com
217.146.177.218	PTR	unknown-217-146-177-x.yahoo.com
217.146.177.227	PTR	unknown-217-146-177-x.yahoo.com
217.146.178.3	PTR	vl-137.bas1-2-prd.ir2.yahoo.com
217.146.178.42	PTR	unknown-217-146-178-x.yahoo.com
217.146.178.57	PTR	unknown-217-146-178-x.yahoo.com
217.146.178.72	PTR	unknown-217-146-178-x.yahoo.com
217.146.178.81	PTR	unknown-217-146-178-x.yahoo.com
217.146.178.144	PTR	unknown-217-146-178-x.yahoo.com
217.146.178.162	PTR	unknown-217-146-178-x.yahoo.com
217.146.178.187	PTR	unknown-217-146-178-x.yahoo.com
217.146.179.0	PTR	0.179.146.217.aprez.ostk.prod.ir2.yahoo.com
217.146.179.30	A	prot.ymx.yahoo.com
217.146.179.32	A+PTR	arba3.forums.maktoob.vip.ir2.yahoo.com
217.146.179.32	A	arb3.forums.a01.yahoodns.net
217.146.179.48	PTR	unknown-217-146-179-x.yahoo.com
217.146.179.113	A+PTR	fe18.intl.search.ir2.yahoo.com
217.146.179.123	PTR	web5.forums.maktoob.ir2.yahoo.com
217.146.179.131	A+PTR	ats1.fp.vip.ir2.yahoo.com
217.146.179.131	A	fr.cinema.yahoo.com
217.146.179.131	A	in.movies.yahoo.com
217.146.179.176	PTR	unknown-217-146-179-x.yahoo.com
217.146.179.200	PTR	bktb02.intl.gossip.search.ir2.yahoo.com
217.146.180.0	PTR	unknown.yahoo.com
217.146.181.0	PTR	unknown.yahoo.com
217.146.181.18	A+PTR	imap511.mail.ir2.yahoo.com
217.146.182.0	PTR	unknown.yahoo.com
217.146.182.2	PTR	ha2.vl-143.bas-2-prd.ir2.yahoo.com
217.146.182.33	PTR	unknown-217-146-182-x.yahoo.com
217.146.182.59	A	web87414.mail.ukl.yahoo.com
217.146.182.177	PTR	unknown-217-146-182-x.yahoo.com
217.146.182.200	PTR	f281.mail.vip.ukl.yahoo.com
217.146.182.202	A+PTR	as12.mail.vip.ukl.yahoo.com
217.146.182.220	A	f272.mail.vip.ukl.yahoo.com
217.146.182.224	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.182.225	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.182.226	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.182.227	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.182.248	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.182.249	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.182.250	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.182.251	A+PTR	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.133	A	web87411.mail.ukl.yahoo.com
217.146.183.185	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.186	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.187	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.188	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.189	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.190	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.191	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.192	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.193	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.194	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.208	PTR	unknown-217-146-183-x.yahoo.com
217.146.183.218	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.219	PTR	unknown.yahoo.com
217.146.183.219	A	newman2.bullet.10025.mail.dns.ukl.yahoo.com
217.146.183.228	A	nm3-vm0.bullet.mail.ukl.yahoo.com
217.146.183.236	A	nm7-vm0.bullet.mail.ukl.yahoo.com
217.146.183.251	PTR	unknown-217-146-183-x.yahoo.com