Robtex

Up: 89.17.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 89.17.40.0/23
Down right: 89.17.42.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
89.17.40.15	A	msk-gateway.intrans.net
89.17.40.19	A	troika-online.com
89.17.40.19	A	kreditami.com
89.17.40.23	A	iridium.kz
89.17.40.31	A	mx2.rwgg.com
89.17.40.134	PTR	mail.ravertical.ru
89.17.40.166	PTR	mxa.rovercomputers.ru
89.17.40.167	PTR	mxb.rovercomputers.ru
89.17.40.175	A	v-service.ru
89.17.40.188	PTR	web-01.rovercomputers.ru
89.17.40.188	A	rovershot.ru
89.17.40.188	A	www.rovershot.ru
89.17.40.189	A	roverpc.com
89.17.40.190	A+PTR	father.rovercomputers.ru
89.17.40.203	A+PTR	remote.midexpo.ru
89.17.40.203	A	micro.midexpo.ru
89.17.40.207	PTR	charodeiki.ru
89.17.40.207	PTR	relay.apollopr.ru
89.17.40.219	A+PTR	mx.entels.ru
89.17.40.222	A	lsys.komir.biz
89.17.40.233	A+PTR	mta.komir.biz
89.17.40.233	A	mx.komir.biz
89.17.40.254	PTR	email.pro-mart.ru
89.17.41.10	PTR	mail.mr-energostroy.ru
89.17.41.30	A	ru.land
89.17.41.30	A	ns2.nvg.ru
89.17.41.34	A+PTR	mail.pgem.ru
89.17.41.34	A	mail.agiseng.ru
89.17.41.53	A+PTR	mail2.sibdel.ru
89.17.41.82	PTR	post.geoforum.ru
89.17.41.86	PTR	mail.tvin-imc.ru
89.17.41.90	PTR	mail.tvin-imc.ru
89.17.41.110	PTR	mail.tvin-imc.ru
89.17.41.133	A+PTR	ns.teleswyz.ru
89.17.41.134	A+PTR	mail.teleswyz.ru
89.17.41.135	A	flat-soft.ru
89.17.41.135	A	hc-coliseum.ru
89.17.41.170	PTR	mx1.salespress.ru
89.17.41.226	A	aminetwork.ru
89.17.41.226	A	www.aminetwork.ru
89.17.41.227	A+PTR	mail.aminetwork.ru
89.17.41.228	PTR	mail.aminetwork.ru
89.17.41.228	A	hotelalpin.ru
89.17.41.229	A	alpinchalet.ru
89.17.42.7	PTR	mail.rvcc.ru
89.17.42.7	A+PTR	mail.vin-import.ru
89.17.42.89	A	mx.fwtrade.ru
89.17.42.96	A+PTR	mail.dominionm.ru
89.17.42.96	A	mail.dominion-m.ru
89.17.42.96	A	mx.mvsoftlab.com
89.17.42.101	PTR	organic-corp.ru
89.17.42.101	PTR	owa.organic-corp.ru
89.17.42.101	A	mail-server.organic-group.ru
89.17.42.104	A	bio-land.ru
89.17.43.14	A	office.studinter.ru
89.17.43.42	A	mail.snpf.ru
89.17.43.54	A	mail.sks-telecom.ru
89.17.43.55	A	mail.itsm-lab.ru
89.17.43.82	PTR	mx1.po-korf.ru
89.17.43.82	A	xn----8sb1abgldcbs8b.xn--p1ai
89.17.43.82	A	korf-online.com
89.17.43.84	A	mail.po-korf.ru
89.17.43.100	A	mail.ru-metiz.ru
89.17.43.195	A+PTR	mail.classics.ru
89.17.43.195	A	mail.clasys.ru
89.17.43.195	A	mail2.classics.ru