Robtex

Up: 87.255.240.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 87.255.240.0/22
Down right: 87.255.244.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
87.255.240.12	A	mx2.lan37.ru
87.255.240.12	A	mx1.lan37.ru
87.255.240.27	A+PTR	mail.iv.makgum.ru
87.255.240.27	A	makgum.ru
87.255.241.80	A+PTR	mail.ivrst.ru
87.255.241.181	PTR	mx.locaflex.ru
87.255.242.80	A+PTR	mail.ensgroup.ru
87.255.242.80	A	mail.raz-dva-tri.pro
87.255.242.115	A	vpn03.morgan.ru
87.255.242.115	A	vpn03.morganstout.com
87.255.242.118	A+PTR	ast.ivsservice.ru
87.255.242.118	A	pdc.ivsservice.ru
87.255.242.168	A+PTR	mail.registratura37.ru
87.255.242.168	A	www.xn--37-6kcanlw5ddbimco.xn--p1ai
87.255.242.168	A	www.registratura37.ru
87.255.242.182	A	ctlf.ru
87.255.242.208	A+PTR	mail.ionb.ru
87.255.242.208	A	www.ionb.ru
87.255.242.208	A	ionb.ru
87.255.242.240	PTR	forward.net.ru
87.255.243.49	A	plast-plus.org
87.255.243.185	PTR	mail.cupets.ru
87.255.243.189	A	ns0.else.ru
87.255.243.205	PTR	mail.bolstar.com
87.255.244.69	A+PTR	gpgr-ivanovo.ru
87.255.244.69	A	www.gpgr-ivanovo.ru
87.255.244.69	A	xn----8sbfbba0b4bjbcn.xn--p1ai
87.255.245.97	PTR	ivlgr.ru
87.255.245.121	PTR	altairalco.ru
87.255.246.2	PTR	r37.fssprus.ru
87.255.246.2	A	mail37.fssprus.ru
87.255.246.9	PTR	gov37.ivanovo.ru
87.255.246.13	PTR	gov37.ivanovo.ru
87.255.246.34	A+PTR	mx1.avtokran.ru
87.255.246.52	PTR	mail.a-point.info
87.255.246.52	A	vpn.a-point.info
87.255.246.65	A+PTR	mx.ivanovostat.ru
87.255.246.74	PTR	radar-avto.ru
87.255.246.74	A+PTR	mail.nordmotors-skoda.ru
87.255.246.74	A+PTR	mail.normandia-avto.ru
87.255.246.100	A+PTR	mail.tm-ankovo.ru
87.255.246.101	A+PTR	tm-ankovo.ru
87.255.246.101	A	mail.tm-ankovo.ru
87.255.246.101	A	www.tm-ankovo.ru
87.255.246.122	A+PTR	mail.city37.ru
87.255.246.122	A	city37.ru
87.255.246.129	PTR	mail.citymark.ru
87.255.246.140	PTR	mx2.ivdor.ru
87.255.246.140	A	mx.ivdor.ru
87.255.246.201	PTR	2-nd.net
87.255.246.201	A	ns3.else.ru
87.255.246.202	PTR	1-st.org
87.255.246.202	A	ns0.1-st.org
87.255.246.202	A	ns.1-st.org
87.255.246.203	PTR	s.duodezzzi.com
87.255.246.217	A+PTR	rosbank.icomtex.ru
87.255.246.234	A	mail.pony-ivn.ru
87.255.246.249	A	comtel.icomtel.ru
87.255.247.41	PTR	igta.ru
87.255.247.44	PTR	mail.igta.ru
87.255.247.100	PTR	s047a.047.pfr.ru
87.255.247.133	PTR	atdl.ru
87.255.247.134	PTR	a113.ru
87.255.247.134	A	atdl.a113.ru
87.255.247.137	PTR	atdl.ru
87.255.247.137	A	ns2.mercott.ru
87.255.247.137	A	ns1.tdl-textile.ru
87.255.247.194	A	ivedu.ru
87.255.247.194	A	www.mou-sosh4.ru
87.255.247.194	A	www.shkola-42.ru
87.255.247.196	PTR	mx.ivedu.ru
87.255.247.204	A	www.xn----7sbfbblhs1ckbe1bnb.xn--p1ai
87.255.247.204	A	xn----7sbfbblhs1ckbe1bnb.xn--p1ai
87.255.247.209	A+PTR	ivgoradm.ru
87.255.247.209	A	ns.ivgoradm.ru
87.255.247.209	A	xn--80addfq2alq.xn--p1ai
87.255.247.217	PTR	host8.ivgoradm.ru
87.255.247.217	A	www.ivuslugi.ru
87.255.247.217	A	ivuslugi.ru
87.255.247.219	PTR	host10.ivgoradm.ru
87.255.247.245	A+PTR	ivsu.ivanovo.ac.ru
87.255.247.245	A	tip1.ru
87.255.247.245	A	w3.ivanovo.ac.ru
87.255.247.246	PTR	u246.ivanovo.ac.ru
87.255.247.247	PTR	main.ivanovo.ac.ru
87.255.247.254	PTR	ivsu2.ivanovo.ac.ru
87.255.247.254	A+PTR	mail.ivanovo.ac.ru