Robtex

Up: 83.136.192.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 83.136.200.0/22
Down right: 83.136.204.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
83.136.200.178	PTR	remote.ambi.cz
83.136.201.2	PTR	nns.ethernet.cz
83.136.201.2	A	www.artica.cz
83.136.201.2	A	star.avi.cz
83.136.201.6	PTR	ndns.ethernet.cz
83.136.201.45	PTR	mail3.ethernet.cz
83.136.201.48	PTR	mail2.ethernet.cz
83.136.201.86	PTR	mail.dsp-praha.cz
83.136.201.86	A	www.mojezbran.cz
83.136.201.86	A	s03.ethernet.cz
83.136.201.101	A	mail.praha.biofaktory.cz
83.136.201.101	A	mail.biofaktory.cz
83.136.201.242	A	pavelbrazda.cz
83.136.202.153	A+PTR	mail.avi.cz
83.136.203.69	A+PTR	anoia.wujiman.net
83.136.203.69	A	ns2.wujiman.net
83.136.203.76	A+PTR	mail.katring.cz
83.136.203.98	PTR	ir1.homolka.cz
83.136.203.98	A	holtem.cz
83.136.203.146	A	www.nconzo.cz
83.136.203.146	A	spis.cz
83.136.203.151	A	nimer.eu
83.136.203.151	A	error414.com
83.136.204.10	A+PTR	gw.ab-plus.cz
83.136.204.18	A+PTR	dubecnet-a.netlucka.cz
83.136.204.30	PTR	alfa.unomed.cz
83.136.204.30	A	remote.unomed.cz
83.136.204.50	A	mail.fccgroup.cz
83.136.204.66	A+PTR	mail.egu-vvn.cz
83.136.204.66	A	mail.eguhv.com
83.136.204.82	A	host.staryapartner.cz
83.136.204.94	A+PTR	mail.pragoboard.cz
83.136.204.94	A	mail.pcb.cz
83.136.204.142	A	lifebar.co.uk
83.136.204.142	A	www.lifefood24.it
83.136.204.142	A	gw4.lifefood.eu
83.136.204.146	PTR	mail.3dtech.cz
83.136.204.170	PTR	server.intesbohemia.cz
83.136.204.202	A+PTR	mail.svses.cz
83.136.204.202	A	ns.svses.cz
83.136.204.226	A	mail.zahradnikovi.cz
83.136.204.250	A	mx.altustc.cz
83.136.204.250	A	fw.altustc.cz
83.136.205.6	A+PTR	mail.egu-prg.cz
83.136.205.14	A+PTR	mail.more-praha.cz
83.136.205.18	PTR	mail.nievelt.cz
83.136.205.22	A+PTR	mail.kovprof.cz
83.136.205.30	PTR	mail.fp.cz