Robtex

Up: 81.4.128.0/17
Can't show all results, try to descend to a more specific CIDR
Down left: 81.4.192.0/19
Down right: 81.4.224.0/19
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.4.195.108	A	nimbo.me
81.4.199.190	A	mail.onlinepresentationtool.com
81.4.202.18	A	mail.vzsp.com
81.4.203.1	PTR	81-4-203-1.dyn.nn.ttknn.net
81.4.210.40	PTR	81-4-210-40.dyn.nn.ttknn.net
81.4.210.193	PTR	81-4-210-193.dyn.nn.ttknn.net
81.4.211.141	PTR	81-4-211-141.dyn.nn.ttknn.net
81.4.221.98	A	inf.kodeks.kirov.ru
81.4.224.184	A	nimbo.me
81.4.229.2	PTR	81-4-229-2.dyn.nn.ttknn.net
81.4.232.1	A+PTR	ns.izhmash.ru
81.4.232.1	A	ns1.izhinet.ru
81.4.232.1	A	izhinet.ru
81.4.232.2	PTR	ns2.izhmash.ru
81.4.232.66	A+PTR	pruzhina.izhmash.ru
81.4.232.104	A	h104.izhmash.ru
81.4.232.183	A	mail.kalashnikovconcern.ru
81.4.232.184	A	mail.kalashnikovconcern.ru
81.4.232.187	A	mx.kalashnikovconcern.ru
81.4.232.188	A	mx.kalashnikovconcern.ru
81.4.232.188	A	mx02.kalashnikov.com
81.4.232.188	A	mx02.kalashnikovconcern.ru
81.4.233.0	A	pp0.izhmash.ru
81.4.233.30	A	pp30.izhmash.ru
81.4.233.70	PTR	pp70.izhmash.ru
81.4.233.81	PTR	pp81.izhmash.ru
81.4.233.94	A	pp94.izhmash.ru
81.4.234.4	A+PTR	freenet59.ru
81.4.234.4	A	mail.freenet59.ru
81.4.234.5	A	ns1.freenet59.ru
81.4.234.6	PTR	ns1.freenet59.ru
81.4.234.6	A	ns2.freenet59.ru
81.4.234.7	A+PTR	ns2.freenet59.ru
81.4.234.7	A	ns1.freenet59.ru
81.4.235.109	A	pppp109.izhmash.ru
81.4.238.1	A	ns3.nivad.ru
81.4.238.14	A	wall.nivad.ru
81.4.238.98	A	tat.nivad.ru
81.4.238.110	A	ifnamvd.nivad.ru
81.4.238.142	A	rustehauto.nivad.ru
81.4.238.170	A	baso.nivad.ru
81.4.239.17	A	tusm3-e0-d.nivad.ru
81.4.239.18	A	cs2-e0-1-b.nivad.ru
81.4.239.74	A	bars.nivad.ru
81.4.239.166	A	izsk.nivad.ru
81.4.241.1	A	prima-lgw-ttk.info-link.ru
81.4.241.7	PTR	tehnotorg2.ttknn.net
81.4.241.10	A	ns2.info-link.ru
81.4.241.24	PTR	nagovitsin.ttknn.net
81.4.241.24	A	planeradar.ru
81.4.241.24	A	www.planeradar.ru
81.4.241.77	PTR	nikolaevig.net
81.4.241.77	A	xn--d1abb4arh2e.xn--80aa6ajv.xn--p1ai
81.4.241.81	PTR	polyarnaya-zvezda.ttknn.net
81.4.241.81	A	lgw-cmobile.info-link.ru
81.4.241.82	A	cmobile.info-link.ru
81.4.241.86	PTR	izhinformenergo.ttknn.net
81.4.241.116	A	ns1.kaunt.ru
81.4.241.165	PTR	fastdev1.ttknn.net
81.4.241.165	A	hishusushi.se
81.4.241.166	A	hishusushi.se
81.4.241.173	A	mail.kaunt.ru
81.4.241.173	A	mail.1-it.org
81.4.241.223	PTR	andrukov.ttknn.net
81.4.241.223	A	a-it.org
81.4.241.223	A	www.plsmazok.ru
81.4.242.2	PTR	81-4-242-2.dyn.nn.ttknn.net
81.4.242.73	PTR	81-4-242-73.dyn.nn.ttknn.net
81.4.243.112	A	for-exp.com
81.4.243.112	A	ebalin.com
81.4.243.112	A	mail.ebalin.com
81.4.245.192	PTR	81-4-245-192.dyn.nn.ttknn.net
81.4.248.1	PTR	izhevsk-router.ttknn.net
81.4.248.65	PTR	izhevsk-router.ttknn.net
81.4.248.66	PTR	telecom-mk.ttknn.net
81.4.248.67	PTR	telecom-mk.ttknn.net
81.4.248.68	PTR	telecom-mk.ttknn.net
81.4.248.132	A+PTR	ns2.udmene.ru
81.4.248.133	A	mx2.udmene.ru
81.4.248.167	A	gw1.quart.me
81.4.248.168	A	smtp1.quart.me
81.4.250.33	PTR	mail.zavod-kmz.ru
81.4.250.33	A	mail.nikapetrotech.com
81.4.251.2	A	ycct6.ru
81.4.251.2	A	ns1.antaris.ru
81.4.251.2	A	ns1.ycct6.ru