Robtex

Up: 91.215.224.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 91.215.232.0/22
Down right: 91.215.236.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
91.215.232.1	PTR	dns.serdi.ru
91.215.232.1	PTR	tiger.serdi.ru
91.215.232.1	A	se.serdi.ru
91.215.232.10	A	test.serdi.ru
91.215.232.13	PTR	ves.georgievsk.ru
91.215.232.13	A	avtovokzalgeo.ru
91.215.232.13	A	gcgb.info
91.215.232.34	PTR	jushop.ru
91.215.232.34	PTR	sk-tp.ru
91.215.232.34	PTR	stol-zakazoff.ru
91.215.232.36	PTR	geomr.ru
91.215.232.36	PTR	www.geomr.ru
91.215.232.37	A	test.georgievsk.ru
91.215.232.45	A	3shkola.org
91.215.232.45	A	disallow.su
91.215.232.45	A	xn--b1abahbrq1aso.xn--p1ai
91.215.232.46	A	xn--b1abahbrq1aso.xn--p1ai
91.215.232.110	A	iptv.serdi.ru
91.215.232.114	PTR	mailves.georgievsk.ru
91.215.232.114	PTR	ns.georgievsk.ru
91.215.232.114	PTR	ns.serdi.ru
91.215.232.185	A	mailves.georgievsk.ru
91.215.232.185	A	relves1.stavre.elektra.ru
91.215.232.186	PTR	v90-ppp56.serdi.ru
91.215.232.194	PTR	zarekovyev.serdi.ru
91.215.233.17	PTR	pool233-17.serdi.ru
91.215.233.34	PTR	pool233-34.serdi.ru
91.215.233.163	PTR	pool233-163.serdi.ru
91.215.233.164	PTR	pool233-164.serdi.ru
91.215.233.168	PTR	pool233-168.serdi.ru
91.215.233.169	PTR	pool233-169.serdi.ru
91.215.233.171	PTR	pool233-171.serdi.ru
91.215.233.177	PTR	pool233-177.serdi.ru
91.215.233.179	PTR	pool233-179.serdi.ru
91.215.233.185	PTR	pool233-185.serdi.ru
91.215.234.84	A	m1auto.ru
91.215.234.99	PTR	pool234-99.serdi.ru
91.215.234.122	PTR	pool234-122.serdi.ru
91.215.236.60	A	www.ms-net.eu
91.215.236.60	A	milejow.eu
91.215.236.60	A	cjo.leczna.pl
91.215.237.114	A	teamprevent.info.pl
91.215.237.154	A	dns.kominflex.com.pl