Robtex

Up: 89.31.32.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 89.31.40.0/22
Down right: 89.31.44.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
89.31.40.3	PTR	ns.pevnalinka.cz
89.31.40.14	A	mail.heavy-metal.cz
89.31.40.14	A	mail.comfortline.cz
89.31.40.73	PTR	73-40-31-89.smartbox.cz
89.31.40.121	PTR	121-40-31-89.smartbox.cz
89.31.40.122	PTR	122-40-31-89.smartbox.cz
89.31.40.177	PTR	177-40-31-89.smartbox.cz
89.31.40.179	PTR	179-40-31-89.smartbox.cz
89.31.41.26	PTR	26-41-31-89.smartbox.cz
89.31.41.26	A	gw.seterm.cz
89.31.41.115	PTR	115-41-31-89.smartbox.cz
89.31.41.131	A+PTR	mail.rudolfov.cz
89.31.41.150	A	smtp.sou-sos.cz
89.31.41.152	PTR	152-41-31-89.smartbox.cz
89.31.41.157	A	rds-ssl.brandysek.cz
89.31.41.162	A	gw.leaderfox.cz
89.31.41.166	A	24sync.org
89.31.41.166	A	24sync.eu
89.31.41.166	A	mail.24sync.cz
89.31.41.174	A	leaderfox.com
89.31.41.174	A	leaderfox.de
89.31.41.252	A	rds-ssl.acom.cz
89.31.41.253	A	mail.acom.cz
89.31.42.6	A	gw.wifiinternet.cz
89.31.42.11	PTR	11-42-31-89.smartbox.cz
89.31.42.66	PTR	exgw.m-line.cz
89.31.42.66	A	gw-argon.argon.cz
89.31.42.74	A	www.m-line.cz
89.31.42.108	A	mail.ga-holding.cz
89.31.42.138	A	do-zlata.cz
89.31.42.139	PTR	139-42-31-89.smartbox.cz
89.31.42.146	PTR	mail.nempt.cz
89.31.42.146	A	fw.nempt.cz
89.31.42.165	A	www.stredniskola.cz
89.31.42.178	PTR	178-42-31-89.smartbox.cz
89.31.42.178	A	vsers.cz
89.31.42.183	A	iwebhosting.cz
89.31.42.185	A	www.stredniskola.eu
89.31.42.202	PTR	202-42-31-89.smartbox.cz
89.31.42.202	A	mail.geminas.cz
89.31.42.223	A	antix.tech4u-cb.cz
89.31.42.250	A	mac.posliemail.eu
89.31.42.255	A	dns3.starnet.cz
89.31.42.255	A	smtp.internet.starnet.cz
89.31.43.12	A	beharovice.eu
89.31.43.34	A	www.datalife.cz
89.31.43.35	A	businesstoleti.cz
89.31.43.35	A	duchodova-reforma-cz.cz
89.31.43.35	A	datalife.cz
89.31.43.82	PTR	82-43-31-89.smartbox.cz
89.31.43.86	A	www.aprex.cz
89.31.43.90	PTR	90-43-31-89.smartbox.cz
89.31.43.96	PTR	96-43-31-89.smartbox.cz
89.31.43.106	PTR	106-43-31-89.smartbox.cz
89.31.44.10	PTR	filebox.cz
89.31.44.10	A	fleska.net
89.31.44.16	PTR	posta.rysoft.cz
89.31.44.16	A	backmail.dateco.cz
89.31.44.24	PTR	24-44-31-89.smartbox.cz
89.31.44.24	A	grimmak.cz
89.31.44.32	PTR	32-44-31-89.smartbox.cz
89.31.44.32	A	mail.orangenet.cz
89.31.44.94	A	barvylakystach.com
89.31.44.126	A	posta.sbs-security.eu
89.31.44.126	A	sbs-wolkerovka.isdata.cz
89.31.44.132	A	mail.aisis.cz
89.31.44.132	A	mail.dokazuto.cz
89.31.44.162	PTR	162-44-31-89.smartbox.cz
89.31.44.165	A	systemynaprezentaci.cz
89.31.44.165	A	www.officebasic.cz
89.31.44.165	A	klinoveremeny.eu
89.31.44.186	A	vpn.ucetni-kladno.cz
89.31.44.193	A+PTR	server1.absolutnoweb.eu
89.31.44.193	A	worldofbadges.com
89.31.44.193	A	intertop.cz
89.31.44.197	A	portal3.kmitex.cz
89.31.44.214	A	mail.uniexpo.cz
89.31.44.214	A	mail.total-servis.cz
89.31.44.223	A	web3po.com
89.31.44.237	A	pindak.net
89.31.45.2	PTR	casiopea.kladnonet.cz
89.31.45.2	A	casiopea.rgs-studio.cz
89.31.45.3	A+PTR	exisdata.kladnonet.cz
89.31.45.3	A	exisdata.kladnonet.eu
89.31.45.3	A	exisdata.pripojenikladno.cz
89.31.45.9	A+PTR	belgarad.kladnonet.cz
89.31.45.12	A	corwin.isdata.cz
89.31.45.12	A	corwin.kladnonet.cz
89.31.45.58	A	posta.spolecneprocesko.cz
89.31.45.159	A	mail.ravotron.com
89.31.45.159	A	lostinzone.com
89.31.45.159	A	ravotron.com
89.31.45.180	A	hercik-studeneves.isdata.cz
89.31.45.232	A	www.kanar.cz
89.31.45.248	A	vankovi.com
89.31.46.170	PTR	server.sevyko.cz
89.31.46.170	A	sevyko.cz
89.31.47.57	A+PTR	mail.mestoborovany.cz
89.31.47.57	A	mail.borovany-cb.cz
89.31.47.57	A	mestoborovany.cz
89.31.47.99	PTR	99-47-31-89.wifiinternet.cz
89.31.47.99	A	primator.novehrady.cz
89.31.47.111	A	devaine.cz
89.31.47.111	A	pvt-janecek.cz
89.31.47.111	A	pdmservis.cz
89.31.47.130	A+PTR	charon.rx.cz
89.31.47.158	A	mail.dvorec.eu