A list of all Czech Republic ASNs including hosting providers, ISPs, and businesses with announced IPv4 and IPv6 prefixes.
| ASN | Type | IPv4 Routes | IPv6 Routes | Company |
|---|---|---|---|---|
| AS16019 | ISP & Mobile | 90 | 17 | Vodafone Czech Republic a.s. |
| AS5610 | ISP & Mobile | 67 | 5 | O2 Czech Republic, a.s. |
| AS21430 | ISP & Mobile | 66 | 5 | WIA spol. s.r.o. |
| AS30738 | Hosting Provider | 62 | 2 | NetArt Group s.r.o. |
| AS15685 | Hosting Provider | 59 | 1 | CASABLANCA INT a.s. |
| AS2571 | Other Business | 55 | 45 | DHL Information Services (Europe) s.r.o |
| AS204666 | Other Business | 37 | 9 | Jiri Tlapak |
| AS29208 | ISP & Mobile | 36 | 5 | Quantcom, a.s. |
| AS42908 | ISP & Mobile | 35 | 9 | O2 Czech Republic, a.s. |
| AS13036 | ISP & Mobile | 35 | 3 | T-Mobile Czech Republic a.s. |
| AS24971 | Hosting Provider | 33 | 13 | MasterDC s.r.o. |
| AS35592 | Hosting Provider | 31 | 4 | Coolhousing s.r.o. |
| AS44489 | ISP & Mobile | 26 | 7 | STARNET, s.r.o. |
| AS201730 | Hosting Provider | 26 | 1 | Cloud4com s.r.o. |
| AS2852 | Government | 26 | 1 | CESNET z.s.p.o. |
| AS5588 | ISP & Mobile | 25 | 2 | T-Mobile Czech Republic a.s. |
| AS49121 | Other Business | 21 | 9 | Infinity Telecom, s.r.o. |
| AS198605 | Other Business | 21 | 8 | AVAST Software s.r.o. |
| AS30764 | ISP & Mobile | 19 | 2 | PODA a.s. |
| AS204383 | ISP & Mobile | 18 | 1 | SPCom s.r.o. |
| AS2118 | Hosting Provider | 18 | 0 | Reliable Communications s.r.o. |
| AS51420 | ISP & Mobile | 18 | 0 | cyrilek.net z.s. |
| AS29134 | Hosting Provider | 17 | 5 | Webglobe, s.r.o. |
| AS60592 | Hosting Provider | 17 | 3 | Gransy s.r.o. |
| AS43541 | Hosting Provider | 16 | 6 | VSHosting s.r.o. |
| AS209155 | Other Business | 15 | 1 | Onehostplanet s.r.o. |
| AS44002 | ISP & Mobile | 13 | 33 | Sys-DataCom s.r.o. |
| AS35236 | Other Business | 13 | 8 | UVT Internet s.r.o. |
| AS15935 | ISP & Mobile | 13 | 4 | ha-vel internet s.r.o. |
| AS16246 | ISP & Mobile | 13 | 2 | O2 Czech Republic, a.s. |
| AS201476 | ISP & Mobile | 13 | 2 | ISP Alliance a.s. |
| AS39392 | Other Business | 12 | 5 | SH.cz s.r.o. |
| AS42422 | Hosting Provider | 12 | 2 | SecurityNet.cz s.r.o. |
| AS202921 | ISP & Mobile | 12 | 1 | CC INTERNET s.r.o. |
| AS210712 | ISP & Mobile | 12 | 1 | ISP Alliance a.s. |
| AS62178 | Other Business | 12 | 1 | MASTER IT Technologies, a.s. |
| AS34955 | Other Business | 12 | 0 | Martin Vicenik |
| AS51248 | Hosting Provider | 11 | 5 | Host-Telecom.com s.r.o. |
| AS12570 | ISP & Mobile | 11 | 2 | O2 Czech Republic, a.s. |
| AS39906 | ISP & Mobile | 11 | 2 | CoProSys a.s. |
| AS24806 | Other Business | 11 | 1 | INTERNET CZ, a.s. |
| AS25512 | ISP & Mobile | 11 | 1 | CD-Telematika a.s. |
| AS44546 | Other Business | 11 | 0 | ALFA TELECOM s.r.o. |
| AS208414 | Hosting Provider | 10 | 101 | WEDOS Internet, a.s. |
| AS47232 | ISP & Mobile | 10 | 6 | ISP Alliance a.s. |
| AS198101 | Other Business | 10 | 4 | Kooperativa pojistovna, a.s., Vienna Insurance Group |
| AS24641 | ISP & Mobile | 10 | 2 | FASTER CZ spol. s r.o. |
| AS200918 | Other Business | 10 | 1 | Pavel Zizka |
| AS202895 | ISP & Mobile | 10 | 1 | TFnet s.r.o. |
| AS200449 | Other Business | 9 | 13 | Qrator Labs CZ s.r.o. |
| AS50698 | Other Business | 9 | 3 | TETA s.r.o. |
| AS198167 | Other Business | 9 | 1 | Apptc.me s.r.o. |
| AS48298 | Other Business | 9 | 1 | MINISTERSTVO VNITRA CR |
| AS48417 | Other Business | 9 | 1 | ITS akciova spolecnost |
| AS56566 | ISP & Mobile | 9 | 1 | SATT a.s. |
| AS29583 | Other Business | 9 | 0 | Spinoco a.s. |
| AS52029 | Other Business | 9 | 0 | Palanet s.r.o. |
| AS43500 | Other Business | 8 | 8 | HBO Europe s.r.o. |
| AS197451 | Other Business | 8 | 4 | Brno University of Technology |
| AS42306 | ISP & Mobile | 8 | 4 | Edera Group a.s. |
| AS202682 | Hosting Provider | 8 | 2 | Geetoo Technology s.r.o. |
| AS28725 | ISP & Mobile | 8 | 2 | CETIN a.s. |
| AS41046 | ISP & Mobile | 8 | 2 | O2 Czech Republic, a.s. |
| AS15425 | ISP & Mobile | 8 | 1 | PODA a.s. |
| AS197206 | Other Business | 8 | 1 | BusinessCom CZ spol. s r.o. |
| AS205248 | Other Business | 8 | 0 | Netassist International s.r.o. |
| AS63113 | Hosting Provider | 8 | 0 | Globecorp Networks |
| AS204860 | Other Business | 7 | 9 | NetX Networks a.s. |
| AS43709 | ISP & Mobile | 7 | 7 | SilesNet s.r.o. |
| AS25192 | Other Business | 7 | 6 | CZ.NIC, z.s.p.o. |
| AS51331 | ISP & Mobile | 7 | 3 | SychrovNET s.r.o |
| AS25424 | ISP & Mobile | 7 | 2 | CEZNET s.r.o. |
| AS20723 | ISP & Mobile | 7 | 1 | AVONET, s.r.o. |
| AS49025 | Other Business | 7 | 1 | PRO-ZETA a.s. |
| AS50398 | ISP & Mobile | 7 | 1 | Fast Communication, s.r.o. |
| AS204949 | Hosting Provider | 7 | 0 | CMIS s.r.o. |
| AS41030 | Other Business | 7 | 0 | Jaroslav Novotny |
| AS43037 | Other Business | 6 | 6 | Seznam.cz, a.s. |
| AS207187 | Other Business | 6 | 3 | TKR Jasek, s.r.o. |
| AS43070 | ISP & Mobile | 6 | 3 | JAW.cz s.r.o. |
| AS28972 | ISP & Mobile | 6 | 2 | M-SOFT, spol. s r.o. |
| AS39761 | Other Business | 6 | 2 | ABAK, Co.Ltd. |
| AS57707 | Hosting Provider | 6 | 2 | Greendata s.r.o. |
| AS60606 | Other Business | 6 | 2 | PRO-ZETA a.s. |
| AS15614 | ISP & Mobile | 6 | 1 | Dragon Internet a.s. |
| AS202877 | ISP & Mobile | 6 | 1 | VEJNET.CZ s.r.o. |
| AS209810 | ISP & Mobile | 6 | 1 | Netcore services s.r.o. |
| AS215704 | ISP & Mobile | 6 | 1 | NGN CZ s.r.o. |
| AS48926 | ISP & Mobile | 6 | 1 | Pe3ny Net s.r.o. |
| AS49985 | Other Business | 6 | 1 | IP4ISP z.s.p.o |
| AS8251 | Hosting Provider | 6 | 1 | FreeTel, s.r.o. |
| AS51424 | Other Business | 6 | 0 | Jiri Sperl |
| AS206438 | ISP & Mobile | 5 | 17 | MX-NET Telekomunikace s.r.o. |
| AS207242 | ISP & Mobile | 5 | 5 | NOEL, s.r.o. |
| AS25234 | Hosting Provider | 5 | 3 | ACTIVE 24, s.r.o. |
| AS39790 | Hosting Provider | 5 | 3 | Web4U s.r.o. |
| AS57728 | ISP & Mobile | 5 | 3 | CEZNET s.r.o. |
| AS207167 | Hosting Provider | 5 | 2 | mapnet IT services s.r.o. |
| AS209369 | Hosting Provider | 5 | 2 | The Cloud Provider s.r.o. |
| AS25248 | Other Business | 5 | 2 | RADIOKOMUNIKACE a.s. |