Robtex

Up: 145.255.232.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 145.255.236.0/23
Down right: 145.255.238.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
145.255.236.7	A+PTR	mx1.bigbox.ru
145.255.236.22	A	mailserv.sfera-it.com
145.255.236.58	A	mail.c-i-p.ru
145.255.237.42	PTR	145-255-237-42.obit.ru
145.255.237.42	A	mail.itctg.ru
145.255.237.150	PTR	145-255-237-150.obit.ru
145.255.237.162	PTR	145-255-237-162.obit.ru
145.255.237.162	A	pro-mine.net
145.255.237.181	PTR	145-255-237-181.obit.ru
145.255.237.181	A	gisca.ru
145.255.238.12	PTR	145-255-238-12.obit.ru
145.255.238.106	A+PTR	mx.interteks.ru
145.255.238.106	A	dterm.volokno.ru
145.255.238.114	A+PTR	mail.miacom.ru
145.255.238.114	A	pop.miacom.ru
145.255.238.114	A	mx2.miacom.ru
145.255.238.122	A	smetr.ru
145.255.238.131	A+PTR	mx1.t-systems.ru
145.255.238.131	A	spbsrv-exmail.t-systems.ru
145.255.238.131	A	ns.t-systems.ru
145.255.238.132	PTR	145-255-238-132.obit.ru
145.255.238.180	PTR	145-255-238-180.obit.ru
145.255.238.180	A	www.x-tina.ru
145.255.238.180	A	inomarka-zapchasti.ru
145.255.238.195	PTR	mail.tgc1-service.ru
145.255.238.195	PTR	mail.tgcs.ru
145.255.238.211	PTR	soft-werke.com
145.255.238.211	A	mailserver.soft-werke.com
145.255.238.211	A	soft-werke.ru
145.255.238.212	A	it-deutsch.com
145.255.239.10	A	mail.baltleasing.ru
145.255.239.12	A	mail2.baltleasing.ru
145.255.239.13	PTR	145-255-239-13.obit.ru
145.255.239.13	A	mail.b-leasing.ru
145.255.239.16	PTR	145-255-239-16.obit.ru
145.255.239.94	PTR	145-255-239-94.obit.ru
145.255.239.94	A	spb.honey-granules.com
145.255.239.94	A	spb.medovdom.ru
145.255.239.126	A	email.brandservice.pro
145.255.239.150	A	ns1.skrazvitie.ru
145.255.239.150	A	skrazvitie.ru
145.255.239.150	A	mail.skrazvitie.ru
145.255.239.162	A+PTR	mail.oasp-sz.ru
145.255.239.174	A+PTR	mail.sev-rus.ru
145.255.239.178	PTR	145-255-239-178.obit.ru
145.255.239.190	PTR	145-255-239-190.obit.ru
145.255.239.255	PTR	145-255-239-255.obit.ru