Robtex

Up: 31.13.0.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 31.13.32.0/20
Down right: 31.13.48.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
31.13.32.2	A	mx.infoprof.ru
31.13.32.2	A	rail.ru
31.13.32.3	A	mx2.infoprof.ru
31.13.32.3	A	mx.rankmaster.ru
31.13.32.42	A	g5.max-comtel.ru
31.13.32.170	PTR	mail.inspst.ru
31.13.32.170	A	mail.atlanstroy.ru
31.13.32.218	PTR	mail.rest-oblomov.ru
31.13.32.227	A+PTR	mail.bank-accent.ru
31.13.33.4	A	joye.ru
31.13.33.4	A	smoke-freedom.ru
31.13.33.4	A	joyetech-russia.com
31.13.33.35	A+PTR	mail.simba-dickie.ru
31.13.33.35	A	mail.simba.ru
31.13.33.35	A	simba.ru
31.13.33.195	A	ns25.prosv.ru
31.13.33.195	A	vpn1.prosv.ru
31.13.33.196	A	mail1.prosv.ru
31.13.33.197	PTR	mail.olmamediagroup.ru
31.13.33.197	A	omgmail.id-neva.spb.ru
31.13.33.225	A	www.expresspublishing.ru
31.13.33.225	A	expresspublishing.ru
31.13.33.225	A	old.prosv.ru
31.13.33.248	A	mail1.prosv.ru
31.13.34.93	A	mail.muller.ru
31.13.34.98	A+PTR	f1.svetets.ru
31.13.34.99	A+PTR	f2.svetets.ru
31.13.34.100	A+PTR	m1.svetets.ru
31.13.34.100	A	m1.technologysv.ru
31.13.34.146	A	mx30.masterwood.su
31.13.34.146	A	vgit.pro
31.13.34.146	A	mail.vgit.pro
31.13.34.147	A	mail.vita.ooo
31.13.34.178	A	mx.olex.ru
31.13.34.252	A	exchange.panerra.ru
31.13.35.30	A	map.mineral.ru
31.13.35.82	A	mail.dezz-mzsr.ru
31.13.35.84	A	dezz-mzsr.ru
31.13.35.86	A	mylink.su
31.13.35.164	A	mail.mozaik.ru
31.13.36.51	A	mail.mgaf.ru
31.13.36.51	A	inet.mgaf.ru
31.13.36.51	A	mgaf.ru
31.13.36.53	A	mail.mgaf.ru
31.13.36.114	A	gw31.eholod.ru
31.13.36.115	A	mail.eholod.ru
31.13.36.134	A	cfctest.mos.ru
31.13.36.138	A	lonmadi-krasnodar.ru
31.13.36.138	A	www.jcbrus.ru
31.13.36.138	A	mail.lonmadi-krasnodar.ru
31.13.36.166	A+PTR	mail.vallexm.ru
31.13.36.202	A	3gon.com
31.13.36.210	A	mx.is-expert.ru
31.13.36.210	A	vpn.eurostroi.ru
31.13.36.210	A	mail.eurostroi.ru
31.13.36.242	A	mx.deco.mos.ru
31.13.36.252	A	mail.finval.ru
31.13.37.34	A	mail.licweb.ru
31.13.37.34	A	mail.apilic.ru
31.13.37.34	A	licweb.ru
31.13.37.66	PTR	nortel.sportfm.ru
31.13.37.68	PTR	codec1.sportfm.ru
31.13.37.69	PTR	kazan-temp.sportfm.ru
31.13.37.92	A	mx.glosav.net
31.13.37.98	PTR	maill.molkonserv.ru
31.13.37.98	A	maill.molkons.ru
31.13.37.100	A	mx.erconproduct.ru
31.13.37.100	A	mx.erkonproduct.ru
31.13.37.101	A	mx.fraumarta.ru
31.13.37.163	PTR	leopard.gokhran.ru
31.13.37.202	PTR	mail.fadm.gov.ru
31.13.37.202	A	exch.fadm.gov.ru
31.13.37.202	A	webmail.senegskaya.ru
31.13.37.210	A	msk.akira-oil.com
31.13.38.74	A+PTR	tanerlon.ergobank.ru
31.13.38.106	A	04-gtw.regent.ru
31.13.38.138	A	gwmow1.sv-tour.ru
31.13.38.140	A	mail.sv-tour.ru
31.13.38.155	A	www.tom-t.ru
31.13.38.155	A	oaotomilino.ru
31.13.38.174	A	rusposm.ru
31.13.38.174	A	moto-snab.ru
31.13.38.214	A	quickarrive.com
31.13.38.219	A	evagd.ru
31.13.39.18	A	ran.asiamusic.ru
31.13.39.19	A	odin.asiamusic.ru
31.13.39.20	A	thor.asiamusic.ru
31.13.39.54	A	mail.ackye.ru
31.13.39.54	A	mail2.ackye.ru
31.13.39.54	A	mail2.smartmetering.ru
31.13.39.226	A	mail.agzvao.ru
31.13.60.18	A	node1.tkmain.ru
31.13.60.19	A	node2.tkmain.ru
31.13.60.20	A	wclub.pro
31.13.60.20	A	dev.tkmain.ru
31.13.60.45	A	gate.mosmedzdrav.ru
31.13.60.46	A	zimbra.gkb-1.org
31.13.60.46	A	mosmedzdrav.ru
31.13.60.46	A	www.mosmedzdrav.ru
31.13.60.70	A	mrko2015.mos.ru
31.13.60.70	A	mrko.mos.ru
31.13.60.76	A	report.keydisk.ru
31.13.60.78	A	ns3.astral-it.ru
31.13.60.145	A	new.budget.mos.ru
31.13.60.145	A	bujet.mos.ru
31.13.60.145	A	budget.mos.ru
31.13.60.147	A	job.mos.ru
31.13.60.175	A	doroga.mos.ru
31.13.60.175	A	dorogi.mos.ru
31.13.60.176	A	m.mos.ru
31.13.60.179	A	ns1.dit.mos.ru
31.13.60.204	A	dorogu.mos.ru
31.13.60.211	A	muradeli.music.mos.ru
31.13.60.211	A	tech.mos.ru
31.13.60.211	A	glinka.music.mos.ru
31.13.60.212	A	muradeli.music.mos.ru
31.13.60.212	A	tech.mos.ru
31.13.60.212	A	glinka.music.mos.ru
31.13.60.230	A	geoportal.mos.ru
31.13.62.99	A	mx4.ptsecurity.ru
31.13.62.107	A	mx3.ptsecurity.com
31.13.62.107	A	mx3.ptsecurity.ru
31.13.63.14	A	mx.gbuenergo.ru
31.13.63.68	PTR	mail.tsaritsino.net
31.13.63.68	A	www.amiprosportpit.ru
31.13.63.68	A	ds-viscont.ru
31.13.63.138	PTR	mail1.mgz.mos.ru
31.13.63.218	A	www.gspts.ru