Robtex

Up: 89.255.64.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 89.255.64.0/23
Down right: 89.255.66.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
89.255.64.1	PTR	cisco.obltelecom.ru
89.255.64.2	A+PTR	mail.desktop.ru
89.255.64.2	PTR	mail.nobel-group.ru
89.255.64.2	PTR	mail.obltelecom.ru
89.255.64.3	PTR	mx.ebtch.com
89.255.64.3	PTR	mx.desktop.ru
89.255.64.3	PTR	mx.drsepric.ru
89.255.64.4	A+PTR	ns1.nobel.su
89.255.64.5	A+PTR	billing.obltelecom.ru
89.255.64.6	PTR	office.obl.tel
89.255.64.6	A	office.nobel.su
89.255.64.7	A	ns1.obltelecom.ru
89.255.64.8	PTR	nagios.obltelecom.ru
89.255.64.8	A	ns2.obl.tel
89.255.64.18	A	good4u.ru
89.255.64.20	A	mail.motc.ru
89.255.64.29	PTR	moon.obltelecom.ru
89.255.64.34	A+PTR	wif.obltelecom.ru
89.255.64.38	A	dhcpd.obltelecom.ru
89.255.64.50	PTR	obl64-50.64.255.89.in-addr.arpa
89.255.64.67	A+PTR	obltelecom.ru
89.255.64.67	A	www.obltelecom.ru
89.255.64.67	A	mosobltelecom.ru
89.255.64.94	A+PTR	sip1.obltelecom.ru
89.255.64.140	PTR	obl64-140.64.255.89.in-addr.arpa
89.255.64.140	A	ns0.pereprava.net
89.255.64.141	PTR	obl64-141.64.255.89.in-addr.arpa
89.255.64.142	PTR	corp.logopark-development.com
89.255.64.142	A	mx1.pereprava.net
89.255.64.142	A	mx0.pereprava.net
89.255.64.143	PTR	obl64-143.64.255.89.in-addr.arpa
89.255.64.255	PTR	obl64-255.64.255.89.in-addr.arpa
89.255.65.27	A+PTR	mail.uk-tm.ru
89.255.65.28	PTR	obl65-28.65.255.89.in-addr.arpa
89.255.65.28	A	v-r-k.ru
89.255.65.30	PTR	obl65-30.65.255.89.in-addr.arpa
89.255.65.34	A	mail.nbtec.ru
89.255.65.34	A	mx1.mail10.net
89.255.65.34	A	owa.mail10.net
89.255.65.66	PTR	obl65-66.65.255.89.in-addr.arpa
89.255.65.66	A	energopsb.ru
89.255.65.68	PTR	obl65-68.65.255.89.in-addr.arpa
89.255.65.68	A	ftp.zd-energo.ru
89.255.65.68	A	zaya.zd-energo.ru
89.255.65.75	PTR	mail.energopsb.ru
89.255.65.75	A	mx1.energopsb.ru
89.255.65.76	PTR	obl65-76.65.255.89.in-addr.arpa
89.255.65.76	A	mail.zd-energo.ru
89.255.65.83	PTR	obl65-83.65.255.89.in-addr.arpa
89.255.65.85	A	estate-tbilisi.com
89.255.65.90	PTR	mx0.pereprava.net
89.255.65.91	PTR	mx0.qblk.com
89.255.65.113	PTR	obl65-113.65.255.89.in-addr.arpa
89.255.65.131	A	ftp.nbtec.ru
89.255.65.132	PTR	ftp.nbtec.ru
89.255.65.132	A	ns2.strr.ru
89.255.65.132	A	ns1.mail10.net
89.255.65.136	A	web.mail10.net
89.255.65.180	PTR	obl65-180.65.255.89.in-addr.arpa
89.255.65.180	A	www.rosgranit.ru
89.255.65.180	A	mx.rosgranit.ru
89.255.65.183	PTR	obl65-183.65.255.89.in-addr.arpa
89.255.65.186	PTR	obl65-186.65.255.89.in-addr.arpa
89.255.65.186	A	mx2.mskstone.com
89.255.65.187	PTR	obl65-187.65.255.89.in-addr.arpa
89.255.65.187	A	www2.mskstone.com
89.255.65.187	A	www.makaronino.ru
89.255.65.188	A+PTR	mx.mskstone.com
89.255.65.188	A	mx.rosgranit.ru
89.255.65.188	A	mail.mskstone.com
89.255.65.210	A+PTR	ns2.nobel.su
89.255.65.255	PTR	obl65-255.65.255.89.in-addr.arpa
89.255.66.66	PTR	obltelecom.ru
89.255.66.66	PTR	stmt.ru
89.255.66.66	PTR	whm.obltele.com
89.255.66.67	PTR	hosting.nobelcorp.ru
89.255.66.67	A	good4u.ru
89.255.66.68	PTR	ns2.nobel.su
89.255.66.69	A+PTR	ns2.nobelcorp.ru
89.255.66.70	PTR	obltelecom.ru
89.255.66.90	PTR	tic-tac.ru
89.255.66.90	A	afanasyev.me
89.255.66.90	A	www.vitalab.ru
89.255.66.91	PTR	labix.ru
89.255.66.92	A+PTR	citomed.ru
89.255.66.92	A	xn--h1amlo.xn--p1ai
89.255.66.92	A	xn--d1abiqjx0a.xn--p1ai
89.255.66.93	PTR	rishka.ru
89.255.66.94	PTR	zhopa.tic-tac.ru
89.255.66.98	PTR	obl66
89.255.66.98	A	home.himky.ru
89.255.66.140	PTR	obl66-140.66.255.89.in-addr.arpa
89.255.66.161	PTR	cisco.obltelecom.ru
89.255.66.162	A+PTR	himki-nat.obltelecom.ru
89.255.66.226	PTR	moon.obltelecom.ru
89.255.66.227	A+PTR	ns2.obltele.com
89.255.66.228	A+PTR	otrs.obltelecom.ru
89.255.66.228	PTR	smotrelka.obltelecom.ru
89.255.66.229	PTR	drweb.obltelecom.ru
89.255.66.234	PTR	asterisk.obltelecom.ru
89.255.66.240	PTR	cisco.obltelecom.ru
89.255.66.255	PTR	obl66-255.66.255.89.in-addr.arpa
89.255.67.9	PTR	himki-nat67-9.obltelecom.ru
89.255.67.12	PTR	himki-nat67-12.obltelecom.ru
89.255.67.93	PTR	obl67
89.255.67.113	PTR	obl67
89.255.67.114	PTR	obl67
89.255.67.255	PTR	obl67