This page gives the number of IPv4 addresses allocated to each Local Internet Registry (LIR) in Czech Republic (CZ) by RIPE NCC (Europe, the Middle East and parts of Central Asia), according to RIPE NCC allocations file.
The link on the number of IPv4 addresses for a LIR redirects to the list of IPv4 and IPv6 addresses allocated to this LIR by RIPE NCC.
The "LIR Info" link for a LIR opens the RIPE NCC Information page for this LIR in a new window (RIPE NCC website).
The table can be sorted by number of IPv4 addresses or by LIR name.
| Rank | Local Internet Registry (LIR) | LIR Code | Number of addresses | Percentage | LIR Info |
|---|---|---|---|---|---|
| 55 | ABAK, Co.Ltd. | cz.abak | 11 264 | 0.138 % | LIR Info |
| 113 | ABLE agency, s.r.o. | cz.able | 4 096 | 0.050 % | LIR Info |
| 113 | AB-NET s.r.o. | cz.abnet | 4 096 | 0.050 % | LIR Info |
| 221 | ABRATICA s. r. o. | cz.abratica | 1 024 | 0.013 % | LIR Info |
| 68 | ACTIVE 24, s.r.o. | cz.globe | 8 960 | 0.110 % | LIR Info |
| 161 | AdminIT, s. r. o. | cz.adminit | 2 048 | 0.025 % | LIR Info |
| 394 | Agile Ventures s.r.o. | cz.agilev | 512 | 0.006 % | LIR Info |
| 221 | Agrostroj Pelhrimov, a.s. | cz.agrostroj | 1 024 | 0.013 % | LIR Info |
| 221 | Ahosting a.s. | cz.ahosting | 1 024 | 0.013 % | LIR Info |
| 389 | Air Bank a.s. | cz.airbank | 768 | 0.009 % | LIR Info |
| 92 | AIRWAYNET, a.s. | cz.airwaynet | 5 120 | 0.063 % | LIR Info |
| 113 | Alberon Letohrad s.r.o | cz.alberon | 4 096 | 0.050 % | LIR Info |
| 405 | Albert Ceska republika, s.r.o. | cz.albert | 256 | 0.003 % | LIR Info |
| 4 | ALFA TELECOM s.r.o. | cz.alfatelecom | 526 848 | 6.450 % | LIR Info |
| 161 | Allegro Retail a.s. | cz.internetmall | 2 048 | 0.025 % | LIR Info |
| 405 | Allwyn Cesko a.s. | cz.sazka | 256 | 0.003 % | LIR Info |
| 161 | Altnet s.r.o. | cz.altnet | 2 048 | 0.025 % | LIR Info |
| 221 | ALTOS software s.r.o. | cz.g2-altos | 1 024 | 0.013 % | LIR Info |
| 221 | Alza.cz a.s. | cz.alzacz | 1 024 | 0.013 % | LIR Info |
| 136 | AmigoNet s.r.o. | cz.amigonet | 3 072 | 0.038 % | LIR Info |
| 221 | ANAFRA a.s. | cz.anafra | 1 024 | 0.013 % | LIR Info |
| 80 | ANECT a.s. | cz.anect | 7 168 | 0.088 % | LIR Info |
| 92 | a-net Liberec s.r.o. | cz.anet | 5 120 | 0.063 % | LIR Info |
| 221 | Apelby Solutions s.r.o. | cz.apelby | 1 024 | 0.013 % | LIR Info |
| 136 | Apptc.me s.r.o. | cz.apptocloud | 3 072 | 0.038 % | LIR Info |
| 221 | AQUA, a.s. | cz.aqua | 1 024 | 0.013 % | LIR Info |
| 215 | Artemis NET s.r.o. | cz.artemis4 | 1 280 | 0.016 % | LIR Info |
| 221 | ASTANA Technologies s.r.o. | cz.astana | 1 024 | 0.013 % | LIR Info |
| 136 | ASTELNET s.r.o. | cz.astelnet | 3 072 | 0.038 % | LIR Info |
| 405 | Ataccama Software, s.r.o. | cz.atc | 256 | 0.003 % | LIR Info |
| 161 | AUTO GAMES PLUS a.s. | cz.bnv-tech | 2 048 | 0.025 % | LIR Info |
| 43 | AVAST Software s.r.o. | cz.asw | 14 336 | 0.175 % | LIR Info |
| 28 | AVONET, s.r.o. | cz.mgi | 19 456 | 0.238 % | LIR Info |
| 136 | Blond & Brown s.r.o. | cz.blondbrown | 3 072 | 0.038 % | LIR Info |
| 221 | Blueboard.cz s.r.o. | cz.blueboardcz | 1 024 | 0.013 % | LIR Info |
| 405 | Blue One, s.r.o. | cz.eceatel | 256 | 0.003 % | LIR Info |
| 221 | BMB-Green s.r.o. | cz.bmb-green | 1 024 | 0.013 % | LIR Info |
| 221 | BOHEMIA ENERGY entity s.r.o. | cz.bee | 1 024 | 0.013 % | LIR Info |
| 161 | BrazdimNET s.r.o. | cz.brazdimnet | 2 048 | 0.025 % | LIR Info |
| 221 | Brnenske komunikace a.s. | cz.bkom | 1 024 | 0.013 % | LIR Info |
| 15 | Brno University of Technology | cz.vutbrnet | 66 560 | 0.815 % | LIR Info |
| 221 | Brouzdal, s.r.o. | cz.brouzdal | 1 024 | 0.013 % | LIR Info |
| 84 | BusinessCom CZ spol. s r.o. | cz.businesscom | 6 144 | 0.075 % | LIR Info |
| 221 | Bydzovsky s.r.o. | cz.bydzovsky | 1 024 | 0.013 % | LIR Info |
| 113 | C2NET s.r.o. | cz.c2net | 4 096 | 0.050 % | LIR Info |
| 21 | CASABLANCA INT a.s. | cz.casablanca | 39 168 | 0.479 % | LIR Info |
| 136 | CC INTERNET s.r.o. | cz.ccinternet | 3 072 | 0.038 % | LIR Info |
| 10 | CD-Telematika a.s. | cz.cdt | 117 760 | 1.442 % | LIR Info |
| 221 | CENDIS, s.p. | cz.cendis | 1 024 | 0.013 % | LIR Info |
| 221 | CESAL s.r.o. | cz.cesal | 1 024 | 0.013 % | LIR Info |
| 394 | CeskaSit.net Networks s.r.o. | cz.ceskasitnet | 512 | 0.006 % | LIR Info |
| 12 | CESNET z.s.p.o. | cz.ten-34 | 107 520 | 1.316 % | LIR Info |
| 8 | CETIN a.s. | cz.cetin | 152 576 | 1.868 % | LIR Info |
| 11 | CEZNET s.r.o. | cz.ceznet21 | 113 664 | 1.391 % | LIR Info |
| 61 | Cloud4com s.r.o. | cz.cloud4com1 | 10 496 | 0.128 % | LIR Info |
| 161 | cloudinfrastack, s.r.o. | cz.cloudinfrastackcom | 2 048 | 0.025 % | LIR Info |
| 221 | Cluster Design s.r.o. | cz.bosson | 1 024 | 0.013 % | LIR Info |
| 161 | CMIS s.r.o. | cz.cmis | 2 048 | 0.025 % | LIR Info |
| 405 | CMIS s.r.o. | cz.cmis5 | 256 | 0.003 % | LIR Info |
| 405 | CMIS s.r.o. | cz.cmis6 | 256 | 0.003 % | LIR Info |
| 136 | CNI Group s.r.o. | cz.visonet | 3 072 | 0.038 % | LIR Info |
| 405 | COMFEEL s.r.o. | cz.comfeel1 | 256 | 0.003 % | LIR Info |
| 221 | Commerce Media s.r.o. | cz.commercemedia | 1 024 | 0.013 % | LIR Info |
| 405 | Computer Systems Consulting s.r.o. | cz.csc | 256 | 0.003 % | LIR Info |
| 221 | ComSource s.r.o. | cz.comsource | 1 024 | 0.013 % | LIR Info |
| 221 | Connect plus s.r.o. | cz.connect | 1 024 | 0.013 % | LIR Info |
| 39 | Coolhousing s.r.o. | cz.coolhousing | 15 360 | 0.188 % | LIR Info |
| 14 | CoProSys a.s. | cz.coprosys | 101 376 | 1.241 % | LIR Info |
| 55 | Core4Net, s.r.o. | cz.core4net | 11 264 | 0.138 % | LIR Info |
| 161 | CORSAT s.r.o | cz.corsat | 2 048 | 0.025 % | LIR Info |
| 221 | Cortex, a.s. | cz.cortex | 1 024 | 0.013 % | LIR Info |
| 221 | CRFreeNet, z.s. | cz.crfreenet | 1 024 | 0.013 % | LIR Info |
| 221 | CUBESOL, s.r.o. | cz.cubesol | 1 024 | 0.013 % | LIR Info |
| 405 | cyrilek.net z.s. | cz.cyrileknet | 256 | 0.003 % | LIR Info |
| 221 | CZECH IT CLUSTER, druzstvo | cz.czechitc | 1 024 | 0.013 % | LIR Info |
| 221 | Czech Telecommunication Office | cz.ctu | 1 024 | 0.013 % | LIR Info |
| 161 | Cznet s.r.o. | cz.cznetsro | 2 048 | 0.025 % | LIR Info |
| 90 | CZ.NIC, z.s.p.o. | cz.nic | 5 632 | 0.069 % | LIR Info |
| 215 | Daktela s.r.o. | cz.daktela | 1 280 | 0.016 % | LIR Info |
| 221 | DaLuNET s.r.o. | cz.dalunet | 1 024 | 0.013 % | LIR Info |
| 63 | DataCamp s.r.o. | cz.datacamp | 9 216 | 0.113 % | LIR Info |
| 221 | Datadelivery s.r.o. | cz.datadelivery | 1 024 | 0.013 % | LIR Info |
| 33 | DATAMAT CZ s.r.o. | cz.datamat | 16 384 | 0.201 % | LIR Info |
| 394 | DataPeer s.r.o. | cz.datapeer | 512 | 0.006 % | LIR Info |
| 221 | Development 777 s.r.o. | cz.kajot | 1 024 | 0.013 % | LIR Info |
| 221 | Dexnet s.r.o. | cz.dexnet | 1 024 | 0.013 % | LIR Info |
| 405 | Dexus Internet s.r.o. | cz.dexus | 256 | 0.003 % | LIR Info |
| 161 | Diadema Internet s.r.o. | cz.diadema | 2 048 | 0.025 % | LIR Info |
| 221 | DIGITAL ACTION s.r.o. | cz.digiact | 1 024 | 0.013 % | LIR Info |
| 221 | DOBNET, z.s. | cz.dobnet | 1 024 | 0.013 % | LIR Info |
| 136 | DPT s.r.o. | cz.datonet | 3 072 | 0.038 % | LIR Info |
| 28 | Dragon Internet a.s. | cz.dragon | 19 456 | 0.238 % | LIR Info |
| 221 | Dr. Max BDC, s.r.o. | cz.drmax | 1 024 | 0.013 % | LIR Info |
| 80 | Druzstvo EUROSIGNAL | cz.eurosignal | 7 168 | 0.088 % | LIR Info |
| 221 | Druzstvo OFX | cz.ofx | 1 024 | 0.013 % | LIR Info |
| 221 | Ecay Networks s.r.o. | cz.ecay | 1 024 | 0.013 % | LIR Info |
| 136 | Economia a.s. | cz.economia | 3 072 | 0.038 % | LIR Info |
| 43 | Edera Group a.s. | cz.blue4 | 14 336 | 0.175 % | LIR Info |
| 221 | EG.D, s.r.o. | cz.egdsro | 1 024 | 0.013 % | LIR Info |
| 136 | eHAMnet, s.r.o. | cz.ehamnet | 3 072 | 0.038 % | LIR Info |
| 161 | ELDATA prazska s.r.o. | cz.eldata | 2 048 | 0.025 % | LIR Info |
| 405 | E LINKX a.s. | cz.elinkx | 256 | 0.003 % | LIR Info |
| 211 | Elorytech s.r.o. | cz.elorytech | 1 536 | 0.019 % | LIR Info |
| 394 | EmbedIT s.r.o. | cz.embedit1 | 512 | 0.006 % | LIR Info |
| 221 | eM Client s.r.o. | cz.emclient | 1 024 | 0.013 % | LIR Info |
| 69 | Emerald Group s.r.o. | cz.emerald | 8 704 | 0.107 % | LIR Info |
| 215 | EMPECOM, s.r.o. | cz.empecom | 1 280 | 0.016 % | LIR Info |
| 72 | Eri Internet s.r.o. | cz.cbezdrat | 8 192 | 0.100 % | LIR Info |
| 221 | Etnetera Core a.s. | cz.etnetera | 1 024 | 0.013 % | LIR Info |
| 221 | EZE a.s. | cz.ezenetwork | 1 024 | 0.013 % | LIR Info |
| 221 | Ezpada s.r.o | cz.ezpada | 1 024 | 0.013 % | LIR Info |
| 24 | FASTER CZ spol. s r.o. | cz.faster | 24 576 | 0.301 % | LIR Info |
| 113 | Fastport a.s. | cz.fastport | 4 096 | 0.050 % | LIR Info |
| 221 | FELDSAM s.r.o. | cz.feldsam | 1 024 | 0.013 % | LIR Info |
| 221 | FIBER CONNECTIONS s.r.o. | cz.fiber1 | 1 024 | 0.013 % | LIR Info |
| 92 | FIBER Network s.r.o. | cz.fiber | 5 120 | 0.063 % | LIR Info |
| 69 | FIBER TELECOM s.r.o. | cz.fibertelecom | 8 704 | 0.107 % | LIR Info |
| 394 | Fio banka, a.s. | cz.fiobanka | 512 | 0.006 % | LIR Info |
| 136 | FIXNET s.r.o. | cz.fixnet | 3 072 | 0.038 % | LIR Info |
| 221 | FixPro, z.s. | cz.fixprozs | 1 024 | 0.013 % | LIR Info |
| 221 | Flowmon Networks a.s. | cz.flowmon | 1 024 | 0.013 % | LIR Info |
| 161 | Fortion Networks, s.r.o. | cz.fortion | 2 048 | 0.025 % | LIR Info |
| 221 | FORTUNA GAME a.s. | cz.fortuna-game | 1 024 | 0.013 % | LIR Info |
| 221 | FORTUNA GAME a.s. | cz.fortunahr | 1 024 | 0.013 % | LIR Info |
| 221 | FORTUNA GAME a.s. | cz.fortunapl | 1 024 | 0.013 % | LIR Info |
| 394 | FORTUNA GAME a.s. | cz.fortunaro | 512 | 0.006 % | LIR Info |
| 221 | FORTUNA GAME a.s. | cz.fortunask | 1 024 | 0.013 % | LIR Info |
| 221 | FOXCONN CZ s.r.o. | cz.foxconn | 1 024 | 0.013 % | LIR Info |
| 389 | Frantisek Toman | cz.toman | 768 | 0.009 % | LIR Info |
| 221 | Freenet Liberec, z.s. | cz.lbcfree | 1 024 | 0.013 % | LIR Info |
| 28 | FreeTel, s.r.o. | cz.klfree | 19 456 | 0.238 % | LIR Info |
| 405 | Fresh Data s.r.o. | cz.fresh | 256 | 0.003 % | LIR Info |
| 215 | Fusion Media, s.r.o. | cz.fusion | 1 280 | 0.016 % | LIR Info |
| 92 | Futruy s.r.o. | cz.kaora | 5 120 | 0.063 % | LIR Info |
| 405 | FuturNET, s.r.o. | cz.futurnet | 256 | 0.003 % | LIR Info |
| 221 | GAMEKO.cz s.r.o. | cz.vpsarea | 1 024 | 0.013 % | LIR Info |
| 161 | GasNet, s.r.o. | cz.gasnet | 2 048 | 0.025 % | LIR Info |
| 221 | Geetoo Technology s.r.o. | cz.g2server | 1 024 | 0.013 % | LIR Info |
| 221 | GeneralNet s.r.o. | cz.generalnet | 1 024 | 0.013 % | LIR Info |
| 92 | GiTy, a.s. | cz.gity | 5 120 | 0.063 % | LIR Info |
| 27 | Global Tech Distribution s.r.o. | cz.global | 19 712 | 0.241 % | LIR Info |
| 221 | GLOBECORP a.s. | cz.globecorp | 1 024 | 0.013 % | LIR Info |
| 113 | GRADACE, spol. s r.o. | cz.gradace | 4 096 | 0.050 % | LIR Info |
| 136 | Gransy s.r.o. | cz.gransy | 3 072 | 0.038 % | LIR Info |
| 62 | GREPA Networks s.r.o. | cz.grepa | 10 240 | 0.125 % | LIR Info |
| 92 | gsnet.cz s.r.o. | cz.net-online | 5 120 | 0.063 % | LIR Info |
| 71 | GTT a.s. | cz.gtt | 8 448 | 0.103 % | LIR Info |
| 221 | H17 Networks, s.r.o. | cz.h17 | 1 024 | 0.013 % | LIR Info |
| 221 | hanspaul-city.net s.r.o. | cz.hcn | 1 024 | 0.013 % | LIR Info |
| 221 | Happy Technik s.r.o. | cz.happy | 1 024 | 0.013 % | LIR Info |
| 16 | ha-vel internet s.r.o. | cz.ha-vel | 50 176 | 0.614 % | LIR Info |
| 394 | HBO Europe s.r.o. | cz.hbo | 512 | 0.006 % | LIR Info |
| 209 | HBO Europe s.r.o. | cz.hboeurope | 1 792 | 0.022 % | LIR Info |
| 405 | HCNET s.r.o. | cz.hcnet | 256 | 0.003 % | LIR Info |
| 221 | H-data, spol. s r.o. | cz.hdata | 1 024 | 0.013 % | LIR Info |
| 211 | HelaPC s.r.o. | cz.helapc | 1 536 | 0.019 % | LIR Info |
| 221 | Heureka Group a.s. | cz.heureka | 1 024 | 0.013 % | LIR Info |
| 92 | hkfree.org z.s. | cz.hkfree | 5 120 | 0.063 % | LIR Info |
| 33 | HODL s.r.o. | cz.hodl | 16 384 | 0.201 % | LIR Info |
| 221 | HoralNET s.r.o. | cz.horalnet | 1 024 | 0.013 % | LIR Info |
| 39 | Host-Telecom.com s.r.o. | cz.host-telecom | 15 360 | 0.188 % | LIR Info |
| 405 | Hostuj to s.r.o. | cz.hostujto | 256 | 0.003 % | LIR Info |
| 211 | HovNet-SERVIS s.r.o. | cz.hovnet-servis | 1 536 | 0.019 % | LIR Info |
| 221 | HVfree.net servis. s.r.o. | cz.hvfreenet | 1 024 | 0.013 % | LIR Info |
| 221 | i2net cz s.r.o. | cz.i2net | 1 024 | 0.013 % | LIR Info |
| 405 | IBA Group a.s. | cz.ibagroup | 256 | 0.003 % | LIR Info |
| 221 | IceWarp Technology, s.r.o. | cz.icewarp | 1 024 | 0.013 % | LIR Info |
| 221 | ICT NWT s.r.o. | cz.ictnwt | 1 024 | 0.013 % | LIR Info |
| 221 | ICT Support, s.r.o. | cz.ictsupport | 1 024 | 0.013 % | LIR Info |
| 33 | IDEAMED s.r.o. | cz.ideamed | 16 384 | 0.201 % | LIR Info |
| 405 | IGLG Network CZ s.r.o. | cz.iglgnetwork | 256 | 0.003 % | LIR Info |
| 221 | igloonet, s.r.o. | cz.igloonet | 1 024 | 0.013 % | LIR Info |
| 161 | ign.cz internet, s.r.o. | cz.ign | 2 048 | 0.025 % | LIR Info |
| 161 | INERA.CZ s.r.o. | cz.ineracz | 2 048 | 0.025 % | LIR Info |
| 113 | inet4 s.r.o. | cz.inet4 | 4 096 | 0.050 % | LIR Info |
| 90 | Infinity Telecom, s.r.o. | cz.inftele | 5 632 | 0.069 % | LIR Info |
| 63 | INFOS Art, s.r.o. | cz.infos | 9 216 | 0.113 % | LIR Info |
| 405 | INIZIO Internet Media s.r.o. | cz.inizio | 256 | 0.003 % | LIR Info |
| 221 | INNC s.r.o. | cz.innc | 1 024 | 0.013 % | LIR Info |
| 161 | innogy Ceska republika a.s | cz.innogy | 2 048 | 0.025 % | LIR Info |
| 161 | INTERCONNECT s.r.o. | cz.interconnect | 2 048 | 0.025 % | LIR Info |
| 26 | INTERNET CZ, a.s. | cz.internet | 22 528 | 0.276 % | LIR Info |
| 221 | Internet Praha Josefov s.r.o. | cz.netjosefov | 1 024 | 0.013 % | LIR Info |
| 221 | Intraweb servis s.r.o. | cz.intraweb | 1 024 | 0.013 % | LIR Info |
| 48 | IP4ISP z.s.p.o | cz.ip4isp | 13 312 | 0.163 % | LIR Info |
| 23 | Ipex A.S | cz.ipexnet | 26 624 | 0.326 % | LIR Info |
| 39 | IP Node s.r.o. | cz.ipnode | 15 360 | 0.188 % | LIR Info |
| 405 | IPVOIP s.r.o. | cz.ipvoip | 256 | 0.003 % | LIR Info |
| 17 | ISP Alliance a.s. | cz.grapesc | 47 360 | 0.580 % | LIR Info |
| 221 | Itego a.s. | cz.altronbs | 1 024 | 0.013 % | LIR Info |
| 159 | ITS akciova spolecnost | cz.its | 2 560 | 0.031 % | LIR Info |
| 113 | It services company s.r.o. | cz.itservices | 4 096 | 0.050 % | LIR Info |
| 221 | IT & WP HOST s.r.o. | cz.wphosting | 1 024 | 0.013 % | LIR Info |
| 161 | IXOXI s.r.o. | cz.ixoxi | 2 048 | 0.025 % | LIR Info |
| 405 | Jan Korinek | cz.mazelbiz | 256 | 0.003 % | LIR Info |
| 221 | Jan Ryznar | cz.rpsnet | 1 024 | 0.013 % | LIR Info |
| 221 | Jan Stetina | cz.giganet-stetina | 1 024 | 0.013 % | LIR Info |
| 110 | JaroNet-services s.r.o. | cz.jaronet-services | 4 352 | 0.053 % | LIR Info |
| 221 | Jaroslav Doubrava | cz.doubrava-net | 1 024 | 0.013 % | LIR Info |
| 109 | JAW.cz s.r.o. | cz.jaw | 4 608 | 0.056 % | LIR Info |
| 221 | JetBrains, s. r. o. | cz.jetbrains | 1 024 | 0.013 % | LIR Info |
| 161 | JHComp s.r.o. | cz.jhcomp | 2 048 | 0.025 % | LIR Info |
| 221 | JimmyNet s.r.o. | cz.jimmynet | 1 024 | 0.013 % | LIR Info |
| 221 | Jiri Chalabala | cz.chalabala | 1 024 | 0.013 % | LIR Info |
| 110 | Jiri Tlapak | cz.jiritlapak | 4 352 | 0.053 % | LIR Info |
| 161 | JM-Networks, s.r.o. | cz.jm-networks | 2 048 | 0.025 % | LIR Info |
| 136 | K2 atmitec s.r.o. | cz.k2atmitec | 3 072 | 0.038 % | LIR Info |
| 84 | Kabelova televize Koprivnice, s.r.o. | cz.ktk | 6 144 | 0.075 % | LIR Info |
| 161 | KABEL servis Praha spol. s r.o. | cz.kabelservis | 2 048 | 0.025 % | LIR Info |
| 136 | KAZA.cz s.r.o. | cz.kazacz | 3 072 | 0.038 % | LIR Info |
| 92 | KHnet.info, z.s. | cz.khnet | 5 120 | 0.063 % | LIR Info |
| 405 | Kiwi.com s.r.o. | cz.kiwicom | 256 | 0.003 % | LIR Info |
| 209 | Kleissner Investments s.r.o. | cz.kleissner | 1 792 | 0.022 % | LIR Info |
| 161 | KLFREE NETWORKS, s.r.o. | cz.networks | 2 048 | 0.025 % | LIR Info |
| 92 | K-net Technical International Group, s.r.o. | cz.k-net | 5 120 | 0.063 % | LIR Info |
| 405 | KnVnet services s.r.o. | cz.knvnet1 | 256 | 0.003 % | LIR Info |
| 159 | Komplet NET s.r.o. | cz.komplet | 2 560 | 0.031 % | LIR Info |
| 161 | Kooperativa pojistovna, a.s., Vienna Insurance Group | cz.kooperativa | 2 048 | 0.025 % | LIR Info |
| 389 | Krajska zdravotni, a.s. | cz.kz | 768 | 0.009 % | LIR Info |
| 221 | Kraj Vysocina | cz.krajvysocina | 1 024 | 0.013 % | LIR Info |
| 161 | KVADOS, a.s. | cz.kvados | 2 048 | 0.025 % | LIR Info |
| 161 | KVE s.r.o. | cz.kvesro | 2 048 | 0.025 % | LIR Info |
| 405 | KXCOMM s.r.o. | cz.kxcomm | 256 | 0.003 % | LIR Info |
| 113 | KYOCERA AVX Components s.r.o. | cz.avx | 4 096 | 0.050 % | LIR Info |
| 394 | Ladislav Kepl | cz.vinaricenet | 512 | 0.006 % | LIR Info |
| 221 | LajsiNET s.r.o. | cz.lajsinet | 1 024 | 0.013 % | LIR Info |
| 113 | LAM plus s.r.o. | cz.lam-plus | 4 096 | 0.050 % | LIR Info |
| 161 | LAN servis s.r.o. | cz.lanserviscz | 2 048 | 0.025 % | LIR Info |
| 215 | Letiste Praha, a. s. | cz.prgaero | 1 280 | 0.016 % | LIR Info |
| 221 | Liberecky kraj | cz.libereckykraj | 1 024 | 0.013 % | LIR Info |
| 405 | Like Media s.r.o. | cz.likemedia | 256 | 0.003 % | LIR Info |
| 136 | Livesport s.r.o. | cz.1start | 3 072 | 0.038 % | LIR Info |
| 221 | Longredi, spol. s r.o. | cz.longredi | 1 024 | 0.013 % | LIR Info |
| 394 | Lotuna Management s.r.o. | cz.lotuna | 512 | 0.006 % | LIR Info |
| 221 | LysaFree, z.s. | cz.lysafree | 1 024 | 0.013 % | LIR Info |
| 221 | MAFRA, a.s. | cz.mafra-cz | 1 024 | 0.013 % | LIR Info |
| 72 | Magnalink, a.s. | cz.magnalink | 8 192 | 0.100 % | LIR Info |
| 221 | Mailkit s.r.o. | cz.mailkit | 1 024 | 0.013 % | LIR Info |
| 110 | mapnet IT services s.r.o. | cz.mapnet | 4 352 | 0.053 % | LIR Info |
| 161 | MaRcom-Eko s.r.o. | cz.marcomeko | 2 048 | 0.025 % | LIR Info |
| 221 | Martin Fryzl | cz.fryzl | 1 024 | 0.013 % | LIR Info |
| 221 | Martin Ph. D. Pustka | cz.mtu | 1 024 | 0.013 % | LIR Info |
| 113 | Masarykova univerzita - Ustav vypocetni techniky | cz.muninet | 4 096 | 0.050 % | LIR Info |
| 19 | MasterDC s.r.o. | cz.master | 41 984 | 0.514 % | LIR Info |
| 113 | MASTER IT Technologies, a.s. | cz.mitt | 4 096 | 0.050 % | LIR Info |
| 221 | MAXICOM HOLDING a.s. | cz.maxicom-holding | 1 024 | 0.013 % | LIR Info |
| 221 | MBC Czech Republic s.r.o. | cz.viasat | 1 024 | 0.013 % | LIR Info |
| 221 | M Computers s.r.o. | cz.mcomputers | 1 024 | 0.013 % | LIR Info |
| 221 | MEMORY computers s.r.o. | cz.memory | 1 024 | 0.013 % | LIR Info |
| 161 | MERIT GROUP a.s | cz.merit-group | 2 048 | 0.025 % | LIR Info |
| 405 | Mesto Kralupy nad Vltavou | cz.mestokralupy | 256 | 0.003 % | LIR Info |
| 221 | Metropolitni sit Humpolec spol. s r.o. | cz.metropolitka | 1 024 | 0.013 % | LIR Info |
| 221 | Metropolitni s.r.o. | cz.metropolitni | 1 024 | 0.013 % | LIR Info |
| 221 | Milan Zelenka | cz.mzelenka | 1 024 | 0.013 % | LIR Info |
| 221 | Ministerstvo financi | cz.mfcr | 1 024 | 0.013 % | LIR Info |
| 405 | Ministerstvo Obrany | cz.ministry | 256 | 0.003 % | LIR Info |
| 136 | MINISTERSTVO VNITRA CR | cz.mvcr | 3 072 | 0.038 % | LIR Info |
| 221 | Miracle Network, spol. s r.o. | cz.miraclenet | 1 024 | 0.013 % | LIR Info |
| 55 | MIRAMO spol. s.r.o. | cz.miramo | 11 264 | 0.138 % | LIR Info |
| 221 | Moneroj s.r.o. | cz.moneroj | 1 024 | 0.013 % | LIR Info |
| 72 | Mopos Communications A.S. | cz.ipnet | 8 192 | 0.100 % | LIR Info |
| 161 | MoravanyNET s.r.o. | cz.moravanynet | 2 048 | 0.025 % | LIR Info |
| 113 | Moravia IT s.r.o. | cz.moravia-it | 4 096 | 0.050 % | LIR Info |
| 221 | Moravskoslezsky kraj | cz.moravskoslezsky | 1 024 | 0.013 % | LIR Info |
| 221 | MOSES Internet s.r.o. | cz.pro-line | 1 024 | 0.013 % | LIR Info |
| 221 | Mraknet s.r.o. | cz.mraknet2 | 1 024 | 0.013 % | LIR Info |
| 39 | M-SOFT, spol. s r.o. | cz.m-soft | 15 360 | 0.188 % | LIR Info |
| 221 | M-wifi internet s.r.o. | cz.m-wifi | 1 024 | 0.013 % | LIR Info |
| 221 | MX-NET Telekomunikace s.r.o. | cz.mxnet | 1 024 | 0.013 % | LIR Info |
| 405 | MyOffice, s.r.o. | cz.myoffice2000 | 256 | 0.003 % | LIR Info |
| 221 | NAM system, a.s. | cz.nam | 1 024 | 0.013 % | LIR Info |
| 221 | Narodni bezpecnostni urad Czech Republic | cz.nbucz | 1 024 | 0.013 % | LIR Info |
| 221 | National Cyber and Information Security Agency | cz.nbu | 1 024 | 0.013 % | LIR Info |
| 221 | Navmatix s.r.o. | cz.navmatix | 1 024 | 0.013 % | LIR Info |
| 405 | NDC ICT Solutions s.r.o. | cz.ndcict | 256 | 0.003 % | LIR Info |
| 113 | NEOS v.o.s. | cz.neos | 4 096 | 0.050 % | LIR Info |
| 84 | NETAIR, s.r.o. | cz.netair | 6 144 | 0.075 % | LIR Info |
| 7 | NetArt Group s.r.o. | cz.netart | 183 296 | 2.244 % | LIR Info |
| 221 | NetArt LIR, k.s. | cz.lirnetart | 1 024 | 0.013 % | LIR Info |
| 405 | Netcom Solutions s.r.o. | cz.boxnet | 256 | 0.003 % | LIR Info |
| 63 | Net-Connect s.r.o. | cz.netconnect | 9 216 | 0.113 % | LIR Info |
| 133 | Netcore services s.r.o. | cz.netcoreservices | 3 584 | 0.044 % | LIR Info |
| 221 | Netcraft Solutions s.r.o. | cz.netcraftsolutions | 1 024 | 0.013 % | LIR Info |
| 221 | NETFORMS s.r.o. | cz.netforms | 1 024 | 0.013 % | LIR Info |
| 161 | NETIO Solutions s.r.o. | cz.netio | 2 048 | 0.025 % | LIR Info |
| 161 | Netlancers s.r.o. | cz.netlancers | 2 048 | 0.025 % | LIR Info |
| 113 | netsearch s.r.o. | cz.netsearch-cc | 4 096 | 0.050 % | LIR Info |
| 405 | NET service solution, s.r.o. | cz.netservice | 256 | 0.003 % | LIR Info |
| 405 | NetSERV, s.r.o. | cz.netserv | 256 | 0.003 % | LIR Info |
| 221 | Netstone s.r.o. | cz.netstone | 1 024 | 0.013 % | LIR Info |
| 48 | NetX Networks a.s. | cz.ntxn | 13 312 | 0.163 % | LIR Info |
| 405 | New Mind s.r.o. | cz.newmind | 256 | 0.003 % | LIR Info |
| 84 | NEW TELEKOM, spol. s r.o. | cz.newtel | 6 144 | 0.075 % | LIR Info |
| 405 | Nextremum s.r.o. | cz.nextremum | 256 | 0.003 % | LIR Info |
| 221 | NGA Services, spol. s r.o. | cz.ngaservices | 1 024 | 0.013 % | LIR Info |
| 132 | NGN CZ s.r.o. | cz.ngncz | 3 840 | 0.047 % | LIR Info |
| 136 | NIX.CZ z.s.p.o. | cz.nix | 3 072 | 0.038 % | LIR Info |
| 92 | NOEL, s.r.o. | cz.noel | 5 120 | 0.063 % | LIR Info |
| 405 | Notino s.r.o. | cz.notino | 256 | 0.003 % | LIR Info |
| 72 | "N_SYS s.r.o." | cz.nsys | 8 192 | 0.100 % | LIR Info |
| 405 | NTS Computer, a.s. | cz.ntscomputer | 256 | 0.003 % | LIR Info |
| 221 | NTV cable s.r.o. | cz.ntvcable | 1 024 | 0.013 % | LIR Info |
| 1 | O2 Czech Republic, a.s. | cz.cznet | 2 016 256 | 24.683 % | LIR Info |
| 43 | OMEGA plus Chrudim s.r.o. | cz.omegaplus | 14 336 | 0.175 % | LIR Info |
| 221 | Omnitel CZ s.r.o. | cz.omnitel | 1 024 | 0.013 % | LIR Info |
| 221 | Omnivery s.r.o. | cz.omnivery | 1 024 | 0.013 % | LIR Info |
| 405 | Ondrej Filip | cz.ondrej | 256 | 0.003 % | LIR Info |
| 221 | Onehostplanet s.r.o. | cz.onehostplanet | 1 024 | 0.013 % | LIR Info |
| 221 | Onlinex NM s.r.o. | cz.onlinex | 1 024 | 0.013 % | LIR Info |
| 221 | Optet network, s. r. o. | cz.optetnetwork | 1 024 | 0.013 % | LIR Info |
| 63 | OptoNet Communication, spol. s.r.o. | cz.optonet | 9 216 | 0.113 % | LIR Info |
| 161 | ORIFLAME SOFTWARE s.r.o. | cz.oriflame-sw | 2 048 | 0.025 % | LIR Info |
| 92 | ORKA systems, s.r.o. | cz.orkasystems | 5 120 | 0.063 % | LIR Info |
| 221 | Oslavany.NET, spolek | cz.oslavany-net | 1 024 | 0.013 % | LIR Info |
| 92 | OvaNet, a.s. | cz.ovanetwork | 5 120 | 0.063 % | LIR Info |
| 136 | PAMICO CZECH, s.r.o. | cz.pamico | 3 072 | 0.038 % | LIR Info |
| 221 | Pardubicky Kraj | cz.pardubickykraj | 1 024 | 0.013 % | LIR Info |
| 221 | Pavel Jochim | cz.hnojnik | 1 024 | 0.013 % | LIR Info |
| 161 | Pavel Zizka | cz.zizka | 2 048 | 0.025 % | LIR Info |
| 221 | PCKBnet s.r.o. | cz.pckbnet | 1 024 | 0.013 % | LIR Info |
| 43 | Pe3ny Net s.r.o. | cz.pe3ny | 14 336 | 0.175 % | LIR Info |
| 221 | Pernix systems s.r.o. | cz.pernix | 1 024 | 0.013 % | LIR Info |
| 405 | PharoCom s.r.o. | cz.pharocom | 256 | 0.003 % | LIR Info |
| 221 | PilsFree servis, s.r.o. | cz.pilsfreeservis | 1 024 | 0.013 % | LIR Info |
| 221 | PilsFree, z. s. | cz.pilsfree | 1 024 | 0.013 % | LIR Info |
| 161 | Playground HUB s.r.o. | cz.pghub | 2 048 | 0.025 % | LIR Info |
| 161 | Plzensky kraj | cz.plzenskykraj | 2 048 | 0.025 % | LIR Info |
| 5 | PODA a.s. | cz.poda | 345 088 | 4.225 % | LIR Info |
| 221 | Position s.r.o. | cz.position | 1 024 | 0.013 % | LIR Info |
| 221 | pragmatel s.r.o. | cz.pragmatel | 1 024 | 0.013 % | LIR Info |
| 221 | PRAHA12.com s.r.o. | cz.praha12com | 1 024 | 0.013 % | LIR Info |
| 221 | Pranet s.r.o. | cz.pranetsro | 1 024 | 0.013 % | LIR Info |
| 161 | Prazska energetika, a.s. | cz.pre | 2 048 | 0.025 % | LIR Info |
| 221 | Prazska plynarenska, a.s. | cz.ise | 1 024 | 0.013 % | LIR Info |
| 221 | Prestonet s.r.o. | cz.prestonet | 1 024 | 0.013 % | LIR Info |
| 405 | ProfiSMS s.r.o. | cz.profisms | 256 | 0.003 % | LIR Info |
| 113 | PRO-ZETA a.s. | cz.prozeta | 4 096 | 0.050 % | LIR Info |
| 221 | PVfree.net, z. s. | cz.pvfreenet | 1 024 | 0.013 % | LIR Info |
| 133 | Qrator Labs CZ s.r.o. | cz.qrator | 3 584 | 0.044 % | LIR Info |
| 405 | Quadruple a.s. | cz.quadruple | 256 | 0.003 % | LIR Info |
| 6 | Quantcom, a.s. | cz.quantcom | 265 216 | 3.247 % | LIR Info |
| 221 | Quick Technology Company s.r.o. | cz.qtc | 1 024 | 0.013 % | LIR Info |
| 13 | RADIOKOMUNIKACE a.s. | cz.cra | 106 496 | 1.304 % | LIR Info |
| 92 | Radovan Ochvat trading as SAO Computers | cz.saocomp | 5 120 | 0.063 % | LIR Info |
| 221 | Raiffeisenbank a.s. | cz.raiffeisenbank | 1 024 | 0.013 % | LIR Info |
| 221 | Reditelstvi silnic a dalnic s.p. | cz.rsd | 1 024 | 0.013 % | LIR Info |
| 161 | Regionalni centrum Olomouc s.r.o. | cz.rco | 2 048 | 0.025 % | LIR Info |
| 9 | Reliable Communications s.r.o. | cz.relcom | 151 552 | 1.855 % | LIR Info |
| 72 | RETE internet, s.r.o. | cz.reteinternet | 8 192 | 0.100 % | LIR Info |
| 221 | Rychly drat, s.r.o. | cz.rychlydrat | 1 024 | 0.013 % | LIR Info |
| 221 | SafeDX s.r.o. | cz.safedx | 1 024 | 0.013 % | LIR Info |
| 63 | SATT a.s. | cz.satt | 9 216 | 0.113 % | LIR Info |
| 113 | Sauron CZ s.r.o. | cz.sauron | 4 096 | 0.050 % | LIR Info |
| 221 | Sberbank CZ, a.s. v likvidaci | cz.sberbank | 1 024 | 0.013 % | LIR Info |
| 221 | Scarfbot Technologies, s.r.o. | cz.scarfbot | 1 024 | 0.013 % | LIR Info |
| 221 | SecurityNet.cz s.r.o. | cz.securitynet-cz | 1 024 | 0.013 % | LIR Info |
| 33 | SELECT SYSTEM, s.r.o. | cz.selectsystem | 16 384 | 0.201 % | LIR Info |
| 221 | Seonet Multimedia s.r.o. | cz.seonet | 1 024 | 0.013 % | LIR Info |
| 221 | ServerNow s.r.o. | cz.sn | 1 024 | 0.013 % | LIR Info |
| 221 | ServerZone s.r.o. | cz.serverzone | 1 024 | 0.013 % | LIR Info |
| 136 | Seznam.cz, a.s. | cz.seznam | 3 072 | 0.038 % | LIR Info |
| 221 | Seznam.cz datova centra, s.r.o. | cz.seznamdc | 1 024 | 0.013 % | LIR Info |
| 113 | SferiaNET.cz s.r.o. | cz.sferia | 4 096 | 0.050 % | LIR Info |
| 22 | SH.cz s.r.o. | cz.supernetwork | 28 672 | 0.351 % | LIR Info |
| 394 | sikmo s.r.o. | cz.sikmo | 512 | 0.006 % | LIR Info |
| 72 | SilesNet s.r.o. | cz.silesnet | 8 192 | 0.100 % | LIR Info |
| 405 | Simpleway Holding a.s. | cz.simpleway | 256 | 0.003 % | LIR Info |
| 92 | SITEL spol. s r.o. | cz.sitel | 5 120 | 0.063 % | LIR Info |
| 221 | SitePark s.r.o. | cz.sitepark | 1 024 | 0.013 % | LIR Info |
| 405 | SIZEK Networks s.r.o | cz.gh-networks | 256 | 0.003 % | LIR Info |
| 221 | SKODA ICT s.r.o. | cz.skoda-ict | 1 024 | 0.013 % | LIR Info |
| 55 | SOFTEX NCP, s.r.o. | cz.softexncp | 11 264 | 0.138 % | LIR Info |
| 136 | Sokolovska uhelna, pravni nastupce, a.s. | cz.suas | 3 072 | 0.038 % | LIR Info |
| 405 | SouthPrague.Net, z.s. | cz.southpraguenet | 256 | 0.003 % | LIR Info |
| 221 | SPC-net s.r.o. | cz.spc-net | 1 024 | 0.013 % | LIR Info |
| 221 | SPCom s.r.o. | cz.spcom | 1 024 | 0.013 % | LIR Info |
| 92 | Speednet, s.r.o. | cz.speednet | 5 120 | 0.063 % | LIR Info |
| 84 | Spinoco a.s. | cz.unient | 6 144 | 0.075 % | LIR Info |
| 405 | Sportisimo s.r.o. | cz.sportisimo | 256 | 0.003 % | LIR Info |
| 221 | Sprava informacnich technologii mesta Plzne, p.o. | cz.sitmp | 1 024 | 0.013 % | LIR Info |
| 52 | Sprintel s.r.o. | cz.jetsystems | 12 288 | 0.150 % | LIR Info |
| 18 | STARNET, s.r.o. | cz.starnet | 45 056 | 0.552 % | LIR Info |
| 136 | State Institute for Drug Control | cz.sukl | 3 072 | 0.038 % | LIR Info |
| 161 | Statni pokladna Centrum sdilenych sluzeb, s.p. | cz.spcss | 2 048 | 0.025 % | LIR Info |
| 221 | Stepan Pokorny | cz.stepan | 1 024 | 0.013 % | LIR Info |
| 221 | Stream-iT, s.r.o. | cz.stream-it | 1 024 | 0.013 % | LIR Info |
| 221 | STUDENT AGENCY k.s. | cz.sa | 1 024 | 0.013 % | LIR Info |
| 47 | SychrovNET s.r.o | cz.sychrovnet | 13 568 | 0.166 % | LIR Info |
| 161 | SYNOT ICT Services, a.s. | cz.sgs | 2 048 | 0.025 % | LIR Info |
| 135 | Sys-DataCom s.r.o. | cz.sys-datacom | 3 328 | 0.041 % | LIR Info |
| 221 | systea s.r.o. | cz.systea | 1 024 | 0.013 % | LIR Info |
| 405 | TECHart systems s.r.o. | cz.techart | 256 | 0.003 % | LIR Info |
| 221 | TechCenter s.r.o. | cz.techcenter | 1 024 | 0.013 % | LIR Info |
| 32 | TechCom s.r.o. | cz.techcomnet | 17 408 | 0.213 % | LIR Info |
| 221 | Technicke site Brno, akciova spolecnost | cz.tsb | 1 024 | 0.013 % | LIR Info |
| 33 | Telco Pro Services, a. s. | cz.telcoproservices | 16 384 | 0.201 % | LIR Info |
| 405 | Teleconnect CZ s.r.o. | cz.teleconnect | 256 | 0.003 % | LIR Info |
| 161 | Telefonzentrale s.r.o. | cz.telefonzentrale | 2 048 | 0.025 % | LIR Info |
| 221 | TERMS a.s. | cz.terms | 1 024 | 0.013 % | LIR Info |
| 55 | TETA s.r.o. | cz.tetanet | 11 264 | 0.138 % | LIR Info |
| 92 | TFnet s.r.o. | cz.tfnetsro | 5 120 | 0.063 % | LIR Info |
| 211 | The Cloud Provider s.r.o. | cz.tcpro | 1 536 | 0.019 % | LIR Info |
| 221 | The Ministry of Agriculture of the Czech Republic | cz.mze | 1 024 | 0.013 % | LIR Info |
| 221 | THINKSMART s.r.o. | cz.thinksmart | 1 024 | 0.013 % | LIR Info |
| 389 | Tipsport.net a.s. | cz.tipsportnet | 768 | 0.009 % | LIR Info |
| 221 | TKC system s.r.o. | cz.tkcsystem | 1 024 | 0.013 % | LIR Info |
| 48 | TKR Jasek, s.r.o. | cz.tkrjasek | 13 312 | 0.163 % | LIR Info |
| 3 | T-Mobile Czech Republic a.s. | cz.radiomobil | 1 001 472 | 12.260 % | LIR Info |
| 136 | TNtech, s.r.o. | cz.touskovnet | 3 072 | 0.038 % | LIR Info |
| 221 | Tomas Budai | cz.itomb | 1 024 | 0.013 % | LIR Info |
| 221 | Tomas Podermanski | cz.tp | 1 024 | 0.013 % | LIR Info |
| 72 | TRINITY CZECH REPUBLIC, s.r.o. | cz.mstr | 8 192 | 0.100 % | LIR Info |
| 80 | TRIOPTIMUM s.r.o. | cz.trionet | 7 168 | 0.088 % | LIR Info |
| 161 | Trustica s.r.o. | cz.trustica | 2 048 | 0.025 % | LIR Info |
| 161 | TTC TELEKOMUNIKACE s.r.o. | cz.ttc | 2 048 | 0.025 % | LIR Info |
| 48 | TTNET s.r.o. | cz.ttnet | 13 312 | 0.163 % | LIR Info |
| 221 | Ultimum Technologies a.s. | cz.ulti-tech | 1 024 | 0.013 % | LIR Info |
| 394 | UnArtel s.r.o. | cz.unartel | 512 | 0.006 % | LIR Info |
| 161 | UNHfree.net z.s. | cz.unhfreenet | 2 048 | 0.025 % | LIR Info |
| 60 | United Networks SE | cz.un | 10 752 | 0.132 % | LIR Info |
| 33 | UVT Internet s.r.o. | cz.uvt | 16 384 | 0.201 % | LIR Info |
| 221 | Valvera s.r.o. | cz.valvera | 1 024 | 0.013 % | LIR Info |
| 221 | Vase media, s.r.o. | cz.vasemedia | 1 024 | 0.013 % | LIR Info |
| 215 | VEJNET.CZ s.r.o. | cz.vejnetcz | 1 280 | 0.016 % | LIR Info |
| 52 | Verizon Czech s.r.o. | cz.uunet | 12 288 | 0.150 % | LIR Info |
| 221 | Virtis s.r.o. | cz.virtis | 1 024 | 0.013 % | LIR Info |
| 84 | Vissado s.r.o. | cz.vissado | 6 144 | 0.075 % | LIR Info |
| 161 | VITALATIV, s.r.o. | cz.vitalativ | 2 048 | 0.025 % | LIR Info |
| 136 | VITKOVICE IT SOLUTIONS a.s. | cz.vitsol | 3 072 | 0.038 % | LIR Info |
| 161 | VIVO CONNECTION spol. s r.o. | cz.vivoconnection | 2 048 | 0.025 % | LIR Info |
| 161 | Vlasimnet s.r.o. | cz.vlasimnet | 2 048 | 0.025 % | LIR Info |
| 2 | Vodafone Czech Republic a.s. | cz.oskarmobil | 1 195 008 | 14.629 % | LIR Info |
| 113 | vpsFree.cz, z.s. | cz.vpsfree | 4 096 | 0.050 % | LIR Info |
| 31 | VSHosting s.r.o. | cz.vshosting | 18 432 | 0.226 % | LIR Info |
| 221 | Vybezek.NET s.r.o. | cz.vybezeknet | 1 024 | 0.013 % | LIR Info |
| 221 | W.A.G. PAYMENT SOLUTIONS, A.S. | cz.wagpayment | 1 024 | 0.013 % | LIR Info |
| 161 | Warnet.cz s.r.o. | cz.warnet | 2 048 | 0.025 % | LIR Info |
| 136 | Web4ce, s.r.o. | cz.web4ce | 3 072 | 0.038 % | LIR Info |
| 92 | Web4U s.r.o. | cz.web4usro | 5 120 | 0.063 % | LIR Info |
| 25 | Webglobe, s.r.o. | cz.ignum | 23 552 | 0.288 % | LIR Info |
| 52 | WEDOS Internet, a.s. | cz.wedos | 12 288 | 0.150 % | LIR Info |
| 389 | Whalebone, s.r.o. | cz.whalebonedns | 768 | 0.009 % | LIR Info |
| 20 | WIA spol. s.r.o. | cz.wia | 40 960 | 0.501 % | LIR Info |
| 72 | Wic-Net, s.r.o. | cz.wicnet | 8 192 | 0.100 % | LIR Info |
| 221 | Windyghoul s.r.o. | cz.windyghoul | 1 024 | 0.013 % | LIR Info |
| 221 | ZCOM.cz s.r.o | cz.tlap | 1 024 | 0.013 % | LIR Info |
| 161 | Zentiva Group, a.s | cz.zentivanet | 2 048 | 0.025 % | LIR Info |
| 405 | Zerops s.r.o. | cz.zerops | 256 | 0.003 % | LIR Info |
| 221 | Zlinsky Kraj | cz.kr-zlinsky | 1 024 | 0.013 % | LIR Info |
| 80 | ZONER a.s. | cz.zoner | 7 168 | 0.088 % | LIR Info |