Robtex

Up: 81.91.176.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 81.91.176.0/23
Down right: 81.91.178.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.91.176.0	PTR	subnet.zomro.com
81.91.176.2	A	telecom-sk.ru
81.91.176.2	A	homer.anders.ru
81.91.176.2	A	ns.anders.ru
81.91.176.4	A+PTR	hst1.anders.ru
81.91.176.5	A	vgk.anders.ru
81.91.176.6	A+PTR	hst3.anders.ru
81.91.176.7	A+PTR	hst2.anders.ru
81.91.176.8	A+PTR	mx1.anders.ru
81.91.176.33	A	33.dialin.anders.ru
81.91.176.34	A+PTR	34.dialin.anders.ru
81.91.176.35	A+PTR	35.dialin.anders.ru
81.91.176.36	A	36.dialin.anders.ru
81.91.176.37	A	37.dialin.anders.ru
81.91.176.38	A	38.dialin.anders.ru
81.91.176.39	A+PTR	39.dialin.anders.ru
81.91.176.66	PTR	mickey.anders.ru
81.91.176.66	A	mail.anders.ru
81.91.176.66	A	mail.telecom-sk.ru
81.91.176.67	A+PTR	donald.anders.ru
81.91.176.69	A	dale.anders.ru
81.91.176.75	A	chip.anders.ru
81.91.176.98	A+PTR	fifi.anders.ru
81.91.176.100	A+PTR	peg.anders.ru
81.91.176.103	A	mail.anders.ru
81.91.176.103	A	mail.telecom-sk.ru
81.91.176.112	PTR	vm1109785.hl.had.pm
81.91.176.124	PTR	vm1522007.nvme.had.yt
81.91.176.125	PTR	vm1185028.hl.had.pm
81.91.176.126	PTR	vm1109963.hl.had.pm
81.91.176.255	PTR	broadcast.zomro.com
81.91.177.0	PTR	subnet.zomro.com
81.91.177.8	PTR	bm18-gw1-l0.spb.anders.ru
81.91.177.30	PTR	tc2-gw1-l0.ams.anders.ru
81.91.177.46	PTR	dmitr-gw1-tun0.msk.anders.ru
81.91.177.67	PTR	vm1399837.nvme.had.yt
81.91.177.78	A+PTR	m9-rs6.msk.anders.ru
81.91.177.81	PTR	m9-gw4-vlan2027.msk.anders.ru
81.91.177.82	PTR	l108-rs1-vlan12.tula.anders.ru
81.91.177.120	A	xxxads.mobi
81.91.177.120	A	mail.xxxads.mobi
81.91.177.124	PTR	limestone.live
81.91.177.125	PTR	vm1122263.hl.had.pm
81.91.177.130	A	mx2.anders.ru
81.91.177.130	A	goofy.anders.ru
81.91.177.130	A	ns2.telecom-sk.ru
81.91.177.154	PTR	km114-gw1-te3-3.vrn.anders.ru
81.91.177.154	A	casino-x-na-dengi.info
81.91.177.162	PTR	anc-rs1-vlan9.fra.anders.ru
81.91.177.241	PTR	tc2-gw1-gi6-1.ams.anders.ru
81.91.177.255	PTR	broadcast.zomro.com
81.91.178.0	PTR	subnet.zomro.com
81.91.178.1	PTR	r86-rs1-vlan474.msk.anders.ru
81.91.178.2	A+PTR	montazhts-gw.anders.ru
81.91.178.6	A+PTR	umostel-gw.anders.ru
81.91.178.16	A	mobille-avito.ru
81.91.178.18	A+PTR	starlink-gw.anders.ru
81.91.178.26	PTR	intratel-gw.anders.ru
81.91.178.26	A	pluto.anders.ru
81.91.178.30	A+PTR	gorseti-gw.anders.ru
81.91.178.30	A	ns1.xrus.ru
81.91.178.33	A	r-casino.win
81.91.178.58	A+PTR	gorseti-mgts-1-gw.anders.ru
81.91.178.66	A	gorseti-mgts-2-gw.anders.ru
81.91.178.69	PTR	m9-gw4-vlan3302.msk.anders.ru
81.91.178.70	A	ons-gw.anders.ru
81.91.178.83	A	betscsgorun.ru
81.91.178.98	A	intelmos-gw.anders.ru
81.91.178.124	PTR	vm1179295.hl.had.pm
81.91.178.125	PTR	vm1276049.nvme.had.yt
81.91.178.130	A	mnogobyte-ipt-gw.anders.ru
81.91.178.137	PTR	b57-gw2-vlan97.spb.anders.ru
81.91.178.137	A	pubg.best
81.91.178.146	PTR	mp2-gw1-l49261.msk.anders.ru
81.91.178.146	A	aura4.finance
81.91.178.149	PTR	m9-gw5-ae3-3301.msk.anders.ru
81.91.178.163	A	myzaym.com
81.91.178.166	A	trinet-gw.anders.ru
81.91.178.170	A+PTR	wiland4-gw.anders.ru
81.91.178.174	A	bigtelecom-gw.anders.ru
81.91.178.180	A	betsplay2x.space
81.91.178.198	A+PTR	rinet-gw.anders.ru
81.91.178.244	PTR	m9-gw4-l57590.msk.anders.ru
81.91.178.251	A+PTR	wiland4-gw.anders.ru
81.91.178.255	PTR	broadcast.zomro.com
81.91.179.0	PTR	subnet.zomro.com
81.91.179.1	PTR	ns0.lan.su
81.91.179.19	A	endex.ru
81.91.179.50	A	dts-gw.anders.ru
81.91.179.61	PTR	m9-gw5-ae3-3327.msk.anders.ru
81.91.179.66	A	netfort-gw.anders.ru
81.91.179.69	PTR	anc-gw2-vlan551.fra.anders.ru
81.91.179.102	A+PTR	legioncom-gw.anders.ru
81.91.179.125	PTR	vm1784137.4ssd.had.wf
81.91.179.126	A	telincom-gw.anders.ru
81.91.179.130	A+PTR	svyazhold-gw.anders.ru
81.91.179.162	A	edunet-gw.anders.ru
81.91.179.178	PTR	ns2.lan.su
81.91.179.204	A	axedigit.com
81.91.179.218	A	mail.ravago.su
81.91.179.255	PTR	broadcast.zomro.com