Robtex

Up: 213.191.64.0/18
Can't show all results, try to descend to a more specific CIDR
Down left: 213.191.96.0/20
Down right: 213.191.112.0/20
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
213.191.99.9	PTR	dns1.ceskasit.net
213.191.99.14	PTR	smtp.ceskasit.net
213.191.99.54	PTR	admin.ceskasit.net
213.191.99.54	PTR	support.ceskasit.net
213.191.99.162	PTR	planet-toys.ceskasit.net
213.191.99.162	PTR	planet-toys.ceskasit.net.ceskasit.net
213.191.99.173	PTR	dohled.ceskasit.net
213.191.100.3	A	213.rychly-net.cz
213.191.100.3	A	219.rychly-net.cz
213.191.100.3	A	*.216.rychly-net.cz
213.191.100.58	A	post.stavoprojekt.eu
213.191.100.168	A	ajfel.cz
213.191.100.168	A	r2d2.civicnet.cz
213.191.100.168	A	kalisz.cz
213.191.100.252	PTR	mail.civicnet.cz
213.191.101.133	A+PTR	smtp.smnet.cz
213.191.101.133	A	smnet.cz
213.191.101.133	A	*.smnet.cz
213.191.103.250	PTR	mail.aztech.cz
213.191.105.2	A	smtp.gtnet.cz
213.191.105.242	A+PTR	fw.kkmicro.cz
213.191.105.242	A	kkmicro.cz
213.191.105.242	A	waytracer.cz
213.191.110.0	A	0.110.smartynet.cz
213.191.110.3	A	mail.kovostanek.cz
213.191.111.7	PTR	7.111.smartynet.cz
213.191.111.7	A	verifik.cz
213.191.111.7	A	*.verifik.cz
213.191.111.71	A+PTR	mail.ocenasek.eu
213.191.111.71	A	luckypictures.nl
213.191.111.80	PTR	80.111.smartynet.cz
213.191.112.0	A	0.112.smartynet.cz
213.191.112.1	PTR	1.112.smartynet.cz
213.191.112.2	PTR	2.112.smartynet.cz
213.191.116.206	A	zsfast.cz
213.191.117.3	PTR	mail.clementas.cz
213.191.117.3	A	mailbackup.clementas.cz
213.191.117.12	A	radekfischer.cz
213.191.117.12	A	ultimateit.cz
213.191.117.44	A	athlonx2.bitr.cz
213.191.117.62	A	datriware.cz
213.191.117.62	A	mujdumsnu.cz
213.191.117.106	PTR	pastelka.zelena.cz
213.191.117.106	A	blumenriviera.cz
213.191.117.106	A	objedname.cz
213.191.120.0	A	0.120.smartynet.cz
213.191.120.151	A	151.120.smartynet.cz
213.191.121.5	PTR	5.121.smartynet.cz
213.191.124.250	PTR	mail.podhorska.cz
213.191.125.2	PTR	mailer.izs-br.cz
213.191.126.131	PTR	galamail.plnet.cz
213.191.126.133	A	lendak.cz
213.191.127.11	A+PTR	server.dateco.cz
213.191.127.11	A	dateco.itic.cz
213.191.127.11	A	dateco.cz
213.191.127.14	A	*.itic.cz
213.191.127.31	A	backmail.vulhm.cz
213.191.127.32	PTR	posta.dtcmail.cz
213.191.127.32	A	backmail.expoinvest.cz
213.191.127.32	A	backmail.unica-technologies.cz
213.191.127.106	PTR	mail.lubstar.cz
213.191.127.162	PTR	dns2.exmasters.com
213.191.127.198	A	gpsgate.cz
213.191.127.198	A	ns3.becom.cz