Robtex

Up: 91.215.120.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 91.215.120.0/23
Down right: 91.215.122.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
91.215.120.0	PTR	0.120.215.91.static.unetcom.ru
91.215.120.6	A+PTR	bgp1.unet.ws
91.215.120.7	PTR	border.unet.ws
91.215.120.7	A	bgp4.unet.ws
91.215.120.10	PTR	ip-120-10.users.unetcom.ru
91.215.120.10	A	bgp5.unet.ws
91.215.120.11	PTR	bgp6.unetcom.ru
91.215.120.11	A	bgp6.unet.ws
91.215.120.130	PTR	mail.production-media.ru
91.215.120.130	A+PTR	mail.promo-oxygen.ru
91.215.120.130	A+PTR	mail.spb-yamal.ru
91.215.120.206	PTR	206.120.215.91.static.unetcom.ru
91.215.120.206	A	vados.ru
91.215.120.206	A	killall.vados.ru
91.215.120.213	PTR	ip-120-213.users.unetcom.ru
91.215.120.231	PTR	ip-120-231.users.unetcom.ru
91.215.120.231	A	mail.arxotech.net
91.215.120.231	A	arxotech.net
91.215.120.253	A	luna.spb-m.ru
91.215.121.3	PTR	ip-121-3.users.unetcom.ru
91.215.121.3	A	2xg.me
91.215.121.55	PTR	ip-121-55.users.unetcom.ru
91.215.121.57	PTR	ip-121-57.users.unetcom.ru
91.215.121.57	A	szypulka.org
91.215.121.136	PTR	ip-121-136.users.unetcom.ru
91.215.121.140	PTR	ip-121-140.users.unetcom.ru
91.215.121.142	PTR	ip-121-142.users.unetcom.ru
91.215.121.148	PTR	ip-121-148.users.unetcom.ru
91.215.121.162	PTR	ip-121-162.users.unetcom.ru
91.215.121.169	PTR	ip-121-169.users.unetcom.ru
91.215.121.180	PTR	ip-121-180.users.unetcom.ru
91.215.121.204	PTR	ip-121-204.users.unetcom.ru
91.215.121.212	PTR	ip-121-212.users.unetcom.ru
91.215.121.222	PTR	ip-121-222.users.unetcom.ru
91.215.121.224	PTR	ip-121-224.users.unetcom.ru
91.215.121.244	PTR	ip-121-244.users.unetcom.ru
91.215.121.248	PTR	ip-121-248.users.unetcom.ru
91.215.121.250	PTR	ip-121-250.users.unetcom.ru
91.215.121.254	PTR	ip-121-254.users.unetcom.ru
91.215.122.9	PTR	ip-122-9.users.unetcom.ru
91.215.122.11	PTR	11.122.215.91.static.unetcom.ru
91.215.122.12	PTR	ip-122-12.users.unetcom.ru
91.215.122.16	PTR	ip-122-16.users.unetcom.ru
91.215.122.21	PTR	ip-122-21.users.unetcom.ru
91.215.122.35	PTR	ip-122-35.users.unetcom.ru
91.215.122.36	PTR	ip-122-36.users.unetcom.ru
91.215.122.50	PTR	ip-122-50.users.unetcom.ru
91.215.122.65	PTR	ip-122-65.users.unetcom.ru
91.215.122.70	PTR	ip-122-70.users.unetcom.ru
91.215.122.78	PTR	ip-122-78.users.unetcom.ru
91.215.122.80	PTR	ip-122-80.users.unetcom.ru
91.215.122.100	PTR	ip-122-100.users.unetcom.ru
91.215.122.115	PTR	ip-122-115.users.unetcom.ru
91.215.122.136	A	xn--b1acdqnpaaq2cwbg8at5b.xn--p1ai
91.215.122.139	PTR	ip-122-139.users.unetcom.ru
91.215.122.139	A	unet.ws
91.215.122.139	A	www.unetkom.ru
91.215.122.158	PTR	mails.7shagov.org
91.215.122.195	A+PTR	weblast.ru
91.215.122.195	A	pcartspb.ru
91.215.122.205	PTR	ip-122-205.users.unetcom.ru
91.215.122.205	A	radix.pro
91.215.122.205	A	mail.radix.pro
91.215.122.233	PTR	ip-122-233.users.unetcom.ru
91.215.123.3	PTR	ip-123-3.users.unetcom.ru
91.215.123.77	PTR	ip-123-77.users.unetcom.ru
91.215.123.123	PTR	ip-123-123.users.unetcom.ru
91.215.123.150	PTR	tv4.unet.ru
91.215.123.150	A	tv4.unet.ws
91.215.123.154	A+PTR	tv6.unet.ws
91.215.123.164	PTR	bgp4.unet.ws
91.215.123.178	A+PTR	iptv.unet.ws
91.215.123.178	A	unetinternet.ru
91.215.123.178	A	newropsha.ru
91.215.123.181	PTR	bgp4.unet.ws
91.215.123.190	A+PTR	tv5.unet.ws
91.215.123.206	A+PTR	tv7.unet.ws
91.215.123.242	PTR	sip4.unet.ws
91.215.123.242	A	sip.unet.ws
91.215.123.242	A	sip1.unet.ws
91.215.123.251	PTR	mail1.tennoryuu.ru