Robtex

Up: 81.94.128.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 81.94.128.0/20
Down right: 81.94.144.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.94.128.0	PTR	0.128.94.81.runext.com
81.94.128.1	A+PTR	ns1.asl.ru
81.94.128.4	A	ns.asl.ru
81.94.128.17	A	admin.diskonttelecom.ru
81.94.128.17	A	admin.runext.com
81.94.128.234	A	relay1.astel.ru
81.94.128.234	A	relay1.runext.com
81.94.129.129	PTR	129.129.94.81.runext.com
81.94.129.162	A	sip.astel.ru
81.94.129.250	A	v01.astel.ru
81.94.130.2	PTR	uprav.ru
81.94.130.66	PTR	mail.aclass.ru
81.94.130.154	A	ns.keepermatic.ru
81.94.130.154	A	mail1.keepermatic.ru
81.94.130.154	A	mail2.keepermatic.ru
81.94.130.230	A	ns2.rskmig.ru
81.94.131.58	A	mail.komstroimonolit.ru
81.94.131.59	A	mail.ksm.su
81.94.131.66	PTR	mail.astelasp.ru
81.94.131.66	A+PTR	smtp.ex.astel.ru
81.94.131.66	A+PTR	smtp.mm.astel.ru
81.94.131.67	PTR	smtp.mm.astel.ru
81.94.131.75	A	rpc.asl.ru
81.94.131.78	A	enetwork.ru
81.94.131.160	PTR	nt.tenfold.ru
81.94.131.161	PTR	gw.tenfold.ru
81.94.131.162	PTR	smtp.nbremont.ru
81.94.131.238	A	relay5.mostravel.com
81.94.132.8	A	admin.discounttelecom.ru
81.94.132.9	A	diskonttelekom.com
81.94.132.9	A	disconttelecom.ru
81.94.132.9	A	runext.com
81.94.133.0	PTR	0.133.94.81.runext.com
81.94.133.58	A	slowl.argumenti.ru
81.94.133.64	PTR	64.133.94.81.runext.com
81.94.133.160	PTR	160.133.94.81.runext.com
81.94.133.194	A	ns2.aventyr.ru
81.94.134.64	PTR	64.134.94.81.runext.com
81.94.135.2	PTR	mail.dryclean.ru
81.94.135.130	A	kem-p.ru
81.94.137.98	PTR	mtco.ru
81.94.137.128	PTR	128.137.94.81.runext.com
81.94.137.131	PTR	131.137.94.81.runext.com
81.94.137.161	PTR	161.137.94.81.runext.com
81.94.137.162	PTR	162.137.94.81.runext.com
81.94.137.193	PTR	193.137.94.81.runext.com
81.94.137.195	PTR	195.137.94.81.runext.com
81.94.137.225	PTR	225.137.94.81.runext.com
81.94.137.227	PTR	227.137.94.81.runext.com
81.94.138.138	A	mail1.voron-auto.ru
81.94.139.53	A	asteltelecom.ru
81.94.139.67	PTR	67.139.94.81.runext.com
81.94.140.102	A	www.mozo.ru
81.94.140.132	A	sun1.soft-tronik.ru
81.94.140.135	A	gate2.soft-tronik.ru
81.94.140.139	A	catus-vivendi.com
81.94.141.16	PTR	16.141.94.81.runext.com
81.94.141.17	PTR	17.141.94.81.runext.com
81.94.141.32	PTR	32.141.94.81.runext.com
81.94.141.155	PTR	155.141.94.81.runext.com
81.94.141.168	PTR	168.141.94.81.runext.com
81.94.141.185	PTR	185.141.94.81.runext.com
81.94.141.241	PTR	241.141.94.81.runext.com
81.94.141.250	PTR	mail.dryclean.ru
81.94.142.62	A	myservice-test.elg-sys.com
81.94.143.130	A	avizosms.ru
81.94.143.234	A	zoe.aqq.me
81.94.143.234	A	z.smsonline.ru
81.94.143.234	A	*.postcard.ru
81.94.144.133	A	m.ckbga.ru
81.94.145.33	PTR	33.145.94.81.runext.com
81.94.145.122	A	route-66.ru
81.94.145.130	PTR	mail.sms-online.com
81.94.145.130	A	mail.fashion-id.ru
81.94.145.130	A	mail1.aqq.me
81.94.146.163	PTR	163.146.94.81.runext.com
81.94.146.224	PTR	224.146.94.81.runext.com
81.94.147.17	PTR	17.147.94.81.runext.com
81.94.147.49	PTR	49.147.94.81.runext.com
81.94.147.75	PTR	mail.geofact.ru
81.94.147.110	A	artsaterra.ru
81.94.147.172	PTR	172.147.94.81.runext.com
81.94.148.2	PTR	mosaris.ru
81.94.148.3	A+PTR	mail.mosaris.ru
81.94.148.42	A	ledm.ru
81.94.148.43	A	ledm.ru
81.94.148.44	A	ledm.ru
81.94.148.45	A	ledm.ru
81.94.148.46	A	ledm.ru
81.94.148.220	A	parkkam.ru
81.94.150.195	PTR	195.150.94.81.runext.com
81.94.150.227	PTR	227.150.94.81.runext.com
81.94.151.17	PTR	17.151.94.81.runext.com
81.94.151.26	PTR	26.151.94.81.runext.com
81.94.151.138	A+PTR	mail.tgt.ru
81.94.151.138	A	mail2.tgt.ru
81.94.151.142	A	mail.tourinfo-rfr.ru
81.94.152.45	PTR	mail.x-ray.ru
81.94.152.89	PTR	89.152.94.81.runext.com
81.94.152.113	PTR	113.152.94.81.runext.com
81.94.153.2	PTR	2.153.94.81.runext.com
81.94.153.34	PTR	34.153.94.81.runext.com
81.94.153.35	PTR	35.153.94.81.runext.com
81.94.153.97	PTR	97.153.94.81.runext.com
81.94.153.130	PTR	130.153.94.81.runext.com
81.94.153.131	PTR	131.153.94.81.runext.com
81.94.153.160	PTR	160.153.94.81.runext.com
81.94.153.162	PTR	162.153.94.81.runext.com
81.94.153.172	A	mail.kadrydocs.ru
81.94.153.172	A	mail.lawleader.ru
81.94.153.172	A	mail.law-leader.ru
81.94.153.193	PTR	193.153.94.81.runext.com
81.94.153.220	A	mx1.ataman-kpc.ru
81.94.153.226	PTR	226.153.94.81.runext.com
81.94.154.44	A	lenkam.ru
81.94.154.241	PTR	241.154.94.81.runext.com
81.94.155.2	A+PTR	eltp.denikin.ru
81.94.155.65	PTR	65.155.94.81.runext.com
81.94.155.67	PTR	67.155.94.81.runext.com
81.94.155.130	PTR	130.155.94.81.runext.com
81.94.155.131	PTR	131.155.94.81.runext.com
81.94.155.161	PTR	161.155.94.81.runext.com
81.94.155.163	PTR	163.155.94.81.runext.com
81.94.155.178	A	sbs.khorog.ru
81.94.155.178	A	khorog.ru
81.94.155.178	A	mail.khorog.ru
81.94.155.194	PTR	194.155.94.81.runext.com
81.94.156.44	A	ns1.digma.ru
81.94.156.44	A	ns1.lc-group.ru
81.94.156.44	A	ns1.lable.ru
81.94.156.128	PTR	128.156.94.81.runext.com
81.94.156.160	PTR	160.156.94.81.runext.com
81.94.157.50	A	ts.merlion.ru
81.94.157.66	PTR	66.157.94.81.runext.com
81.94.157.160	PTR	160.157.94.81.runext.com
81.94.158.23	PTR	23.158.94.81.runext.com
81.94.158.74	PTR	74.158.94.81.runext.com
81.94.158.82	PTR	82.158.94.81.runext.com
81.94.158.82	A	vernkam.ru
81.94.158.174	PTR	174.158.94.81.runext.com
81.94.158.201	PTR	201.158.94.81.runext.com
81.94.158.241	PTR	241.158.94.81.runext.com
81.94.158.249	PTR	249.158.94.81.runext.com
81.94.159.33	PTR	33.159.94.81.runext.com
81.94.159.49	PTR	49.159.94.81.runext.com
81.94.159.137	PTR	137.159.94.81.runext.com
81.94.159.161	PTR	161.159.94.81.runext.com
81.94.159.185	PTR	185.159.94.81.runext.com
81.94.159.201	PTR	201.159.94.81.runext.com
81.94.159.255	PTR	255.159.94.81.runext.com