Robtex

Up: 81.5.64.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 81.5.80.0/21
Down right: 81.5.88.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.5.80.1	A	gw.vfcom.ru
81.5.80.2	A	ns2.vfcom.ru
81.5.80.3	A	ns1.vfcom.ru
81.5.80.4	A	ns0.bobr-telecom.ru
81.5.80.10	A	ns1.vfcom.ru
81.5.80.11	A	ns2.vfcom.ru
81.5.80.135	A	smtp.infoitcom.ru
81.5.80.141	A	email.office-device.ru
81.5.80.141	A	exch.office-device.ru
81.5.80.143	A	avtodorstroy.org
81.5.80.182	A	infoitcom.ru
81.5.80.190	A	vfcom.ru
81.5.80.201	A	infoitcom.ru
81.5.80.202	A	bobr-telecom.ru
81.5.80.230	A	smtp.vfcom.ru
81.5.80.230	A	mail.vfcom.ru
81.5.80.234	A	apps.vbalance.ru
81.5.81.5	PTR	speedtest.telecom.mipt.ru
81.5.81.76	PTR	cache.google.com
81.5.81.76	A	r1.sn-hp2u-n8ve.googlevideo.com
81.5.81.76	A	r1---sn-hp2u-n8ve.googlevideo.com
81.5.81.225	A	faki.ru
81.5.83.6	A+PTR	81.5.83.6.dhcp.mipt-telecom.ru
81.5.83.6	A	techgrow24.com
81.5.83.6	A	ilp.su
81.5.83.112	A+PTR	81.5.83.112.dhcp.mipt-telecom.ru
81.5.83.112	A	qap.su
81.5.83.246	A+PTR	81.5.83.246.dhcp.mipt-telecom.ru
81.5.84.0	PTR	81.5.84.0.dhcp.mipt-telecom.ru
81.5.84.1	A+PTR	n2-81.5.84.1.mipt-telecom.ru
81.5.84.7	A	iui.ru
81.5.84.16	A	81.5.84.16.dhcp.mipt-telecom.ru
81.5.86.125	A+PTR	81.5.86.125.dhcp.mipt-telecom.ru
81.5.86.196	A+PTR	81.5.86.196.dhcp.mipt-telecom.ru
81.5.86.218	A+PTR	81.5.86.218.dhcp.mipt-telecom.ru
81.5.88.0	PTR	81.5.88-net.mipt.ru
81.5.88.3	A+PTR	relaydlg-01.paragon-software.com
81.5.88.3	A	dlg-gw.paragon-software.com
81.5.88.4	PTR	pr3.mipt.ru
81.5.88.7	A	www.cao-rhms.ru
81.5.88.7	A	mx.cao-rhms.ru
81.5.88.26	A	aerology.org
81.5.88.53	PTR	orm.mipt.ru
81.5.88.53	A	meteorad.ru
81.5.88.53	A	www.meteorad.ru
81.5.88.57	PTR	mail.chemrar.info
81.5.88.64	A	ofc4.agava.net
81.5.88.65	A+PTR	ofc5.agava.net
81.5.88.68	A	komet.mipt.ru
81.5.88.77	A	aerology.org
81.5.88.77	A	www.aerology.org
81.5.88.94	A+PTR	cscmsk.chemdiv.com
81.5.88.108	PTR	ineld.mipt.ru
81.5.88.108	A	mx1.inel-display.ru
81.5.88.132	PTR	mx.cao-rhms.ru
81.5.88.132	A	ionosphere.ru
81.5.88.135	A+PTR	mail.gek.ru
81.5.88.135	A	gek.mipt.ru
81.5.88.135	A	office.gek.mipt.ru
81.5.88.136	PTR	farmterra.ru
81.5.88.152	A	handy-safe.ru
81.5.88.160	A	mx10.paragon-software.com
81.5.88.160	A	spline-gw.paragon-software.com
81.5.88.161	A	slovoed.de
81.5.88.161	A	slovoed.net
81.5.88.168	PTR	gate1.agava.net.ru
81.5.88.178	A	mail.etb-lab.com
81.5.88.181	A	paragonbox.com
81.5.88.182	A	mx10.paragon-software.com
81.5.88.182	A	ns2.paragon-software.com
81.5.89.5	A	gva.mipt.ru
81.5.90.0	PTR	81.5.90-net.mipt.ru
81.5.90.43	A	email.mystery.ru
81.5.90.44	A	email2.mystery.ru
81.5.90.44	A	mx1.mystery.ru
81.5.90.50	A	gw.mystery.ru
81.5.90.52	PTR	email.mystery.ru
81.5.90.53	A	vpn.mystery.ru
81.5.90.62	A	gw1-c7609-tengb1.mipt.ru
81.5.90.72	A	n2-core.mipt.ru
81.5.90.98	PTR	bb100.crouter1.telecom.mipt.ru
81.5.90.233	PTR	ns.inel.ru
81.5.90.237	A	poster.inel.ru
81.5.91.0	PTR	81.5.91-net.mipt.ru
81.5.91.1	PTR	n2-core.mipt.ru
81.5.91.1	A	server-farm-gw.mipt.ru
81.5.91.2	A+PTR	irc.mipt.ru
81.5.91.6	A	smtp.mipt.ru
81.5.91.6	A	relay2.telecom.mipt.ru
81.5.91.10	A	smtp.mipt.ru
81.5.91.22	PTR	zimbra.telecom.mipt.ru
81.5.91.22	A	ns2.itbrat.ru
81.5.91.22	A	ns2.tenantsportal.ru
81.5.91.32	A+PTR	mail.mipt.ru
81.5.91.32	A	pop3.mipt.ru
81.5.91.40	PTR	post.mipt.ru
81.5.91.44	A	brain.telecom.mipt.ru
81.5.91.65	PTR	yet-another-telecom-core
81.5.91.66	A+PTR	dolgoprudny.net
81.5.91.66	A	www.dolgoprudny.net
81.5.91.66	A	xn--d1aodgbmvf.xn--p1ai
81.5.91.72	A	wus.dgap.mipt.ru
81.5.91.86	A	ns2.ardev-studio.com
81.5.91.86	A	ardev.ru
81.5.91.86	A	ardev-studio.ru
81.5.91.93	PTR	petrel.telecom.mipt.ru
81.5.92.0	PTR	81.5.92.0.dhcp.mipt-telecom.ru
81.5.92.8	PTR	81.5.92.8.dhcp.mipt-telecom.ru
81.5.92.20	A+PTR	81.5.92.20.dhcp.mipt-telecom.ru
81.5.92.20	A	xn--80aajhqijlbcbhfb1bt6c6l.xn--p1ai
81.5.92.20	A	nanoscantech.com
81.5.92.51	A+PTR	81.5.92.51.dhcp.mipt-telecom.ru
81.5.93.14	A	jenkers.com
81.5.93.166	A	81.5.93.166.dhcp.mipt-telecom.ru
81.5.94.5	A+PTR	81.5.94.5.dhcp.mipt-telecom.ru
81.5.94.5	A	vsld.ru
81.5.94.7	A+PTR	81.5.94.7.dhcp.mipt-telecom.ru
81.5.95.88	A	sport.mipt.ru
81.5.95.90	A+PTR	mail.gagarindecor.com
81.5.95.90	A	gagarindecor.com
81.5.95.193	PTR	streamer-center.ru
81.5.95.211	A	sharkin.ru
81.5.95.239	A	nnso.ru
81.5.95.239	A	neuron.su
81.5.95.239	A	ahsc.ru