Robtex

Up: 217.145.128.0/19
Can't show all results, try to descend to a more specific CIDR
Down left: 217.145.144.0/21
Down right: 217.145.152.0/21
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
217.145.144.50	A+PTR	ns2.ruscom.ru
217.145.144.50	A	ns2.rgntelecom.ru
217.145.144.51	A+PTR	51.ruscom.ru
217.145.144.52	A+PTR	52.ruscom.ru
217.145.145.11	A+PTR	ns.ruscom.ru
217.145.145.13	PTR	www.rgntelecom.ru
217.145.145.14	PTR	www.ruscom.ru
217.145.145.14	A	bsd50.ruscom.ru
217.145.145.17	PTR	c1.ruscom.ru
217.145.145.17	A	metoo72.ru
217.145.145.17	A	www.metoo72.ru
217.145.145.18	PTR	mail.ruscom.ru
217.145.145.18	A	pop.nikka.ru
217.145.145.18	A	ns1.ruscom.ru
217.145.145.109	A	sid.ruscom.ru
217.145.145.112	A	rfn.ruscom.ru
217.145.145.114	A	r72.center-inform.ru
217.145.145.115	A	server.ruscom.ru
217.145.145.143	A	georeserv.ruscom.ru
217.145.145.150	A	aif.ruscom.ru
217.145.145.157	A+PTR	rstyle.ruscom.ru
217.145.145.186	PTR	gw.p-k-k.ru
217.145.145.186	A	mail.ifg.su
217.145.146.107	A	mail.anturion.org
217.145.146.234	PTR	mail.uni-center.com.146.145.217.in-addr.arpa
217.145.146.234	A	mail.uni-center.com
217.145.146.235	A	xn--80aacwgznfscl.xn--p1ai
217.145.146.235	A	zapsibstoma.ru
217.145.146.244	PTR	home.rgntelecom.ru
217.145.146.244	A	mail.tkrt.ru
217.145.146.244	A	v.uhta.ru
217.145.148.5	PTR	5-148.rgntelecom.ru
217.145.148.8	PTR	8-148.rgntelecom.ru
217.145.149.10	PTR	10-149.rgntelecom.ru
217.145.150.3	A	mail.bsdbox.ru
217.145.150.4	A	20142014.ru
217.145.151.129	A+PTR	ns.ans.aero
217.145.151.129	A	aqua.ans.aero
217.145.151.129	A	ns.v-mail.ru
217.145.151.130	PTR	wages.ans.aero
217.145.151.131	PTR	office.ans.aero
217.145.151.145	PTR	aqua.ans.aero
217.145.151.146	A+PTR	vzc.ans.aero
217.145.151.147	A	tyumen.ans.aero
217.145.151.148	PTR	mr8.tyumen.ans.aero
217.145.151.162	PTR	mkm.ans.aero
217.145.151.162	A	mail.dina.ans.aero
217.145.151.178	A	edge.ans.aero