Czechia
Top organizations
| Organization | IPs | Ranges |
|---|---|---|
| O2 Czech Republic, a.s. | 2.04M | 142 |
| Vodafone Czech Republic a.s. | 1.21M | 46 |
| T-Mobile Czech Republic a.s. | 1.07M | 39 |
| CESNET z.s.p.o. | 849.9K | 21 |
| PODA a.s. | 347.1K | 25 |
| Quantcom, a.s. | 265.5K | 31 |
| CETIN a.s. | 150.5K | 7 |
| CEZNET s.r.o. | 126.7K | 38 |
| CD-Telematika a.s. | 117.8K | 11 |
| RADIOKOMUNIKACE a.s. | 106.8K | 5 |
| DHL Information Services Europe s.r.o | 76.0K | 22 |
| Brno University of Technology | 67.1K | 11 |
| STARNET, s.r.o. | 64.8K | 25 |
| MasterDC s.r.o. | 57.3K | 29 |
| ha-vel internet s.r.o. | 49.7K | 8 |
| INTERNET CZ, a.s. | 45.8K | 11 |
| ALFA TELECOM s.r.o. | 44.3K | 41 |
| WIA spol. s.r.o. | 41.5K | 65 |
| ISP Alliance a.s. | 38.7K | 35 |
| CoProSys a.s. | 33.8K | 27 |
| CASABLANCA INT a.s. | 31.2K | 57 |
| SH.cz s.r.o. | 27.6K | 8 |
| Ipex A.S | 26.6K | 5 |
| FASTER CZ spol. s r.o. | 26.1K | 18 |
| Webglobe, s.r.o. | 22.8K | 17 |
Top ASNs
| ASN | Name | IPs |
|---|---|---|
| AS5610 | O2 Czech Republic, a.s. | 1.54M |
| AS16019 | Vodafone Czech Republic a.s. | 1.21M |
| AS13036 | T-Mobile Czech Republic a.s. | 1.03M |
| AS2852 | CESNET z.s.p.o. | 849.9K |
| AS29208 | Quantcom, a.s. | 265.5K |
| AS30764 | PODA a.s. | 218.1K |
| AS42908 | O2 Czech Republic, a.s. | 183.3K |
| AS28725 | CETIN a.s. | 134.1K |
| AS16246 | O2 Czech Republic, a.s. | 133.1K |
| AS25512 | CD-Telematika a.s. | 117.8K |
| AS15425 | PODA a.s. | 110.6K |
| AS25248 | RADIOKOMUNIKACE a.s. | 106.8K |
| AS2571 | DHL Information Services (Europe) s.r.o | 76.0K |
| AS197451 | Brno University of Technology | 66.8K |
| AS31246 | O2 Czech Republic, a.s. | 66.6K |
| AS44489 | STARNET, s.r.o. | 64.8K |
| AS24971 | MasterDC s.r.o. | 57.3K |
| AS12570 | O2 Czech Republic, a.s. | 54.0K |
| AS15935 | ha-vel internet s.r.o. | 49.7K |
| AS24806 | INTERNET CZ, a.s. | 45.8K |
| AS44546 | ALFA TELECOM s.r.o. | 44.3K |
| AS6740 | CEZNET s.r.o. | 42.0K |
| AS21430 | WIA spol. s.r.o. | 41.5K |
| AS25424 | CEZNET s.r.o. | 33.8K |
| AS39906 | CoProSys a.s. | 33.8K |
Regions / states / provinces
Network composition
How Czechia's allocated IPv4 space breaks down by operator type, regional registry, and block size.
| Category | IPv4 | Share |
|---|---|---|
| Enterprise | 3.99M |
58.9%
|
| Mobile | 2.07M |
30.6%
|
| ISP / Telecom | 577.8K |
8.5%
|
| Academic / Research | 69.9K |
1.0%
|
| Hosting / Cloud | 55.3K |
0.8%
|
| Government | 3.8K |
0.1%
|
| CDN | 1.0K |
0.0%
|
| Registry | IPv4 | Share |
|---|---|---|
| RIPE NCC | 7.60M |
85.2%
|
| ARIN | 1.30M |
14.5%
|
| APNIC | 17.6K |
0.2%
|
| AFRINIC | 6.2K |
0.1%
|
| LACNIC | 1.1K |
0.0%
|
Routing & security
Live BGP routing footprint for Czechia from our global collectors, with RPKI route-origin validation coverage.
RPKI-valid % = announced prefixes with a matching Route Origin Authorization. Live routing →
Web3 footprint
Czechia hosts 27 observed decentralized-network nodes across 3 networks. It’s a neutral signal — it does not affect the reputation score. See the full web3 node map.
Reverse-DNS, threat intelligence & internet health
How much of Czechia's address space resolves to a hostname, how much appears on public threat blocklists, how widely the population is online, and independent signals of censorship and outages.
Reverse-DNS + threat-blocklist footprint from our own scanning & 8 threat-intel feeds. Internet adoption from the World Bank; censorship measurements from OONI; outage detection from IODA / Georgia Tech; connection speed from Cloudflare Radar.
Frequently Asked Questions
How many IPv4 addresses are allocated to Czechia?
Czechia has 8,925,735 IPv4 addresses allocated across 3,864 network ranges. These allocations are managed by regional internet registries and assigned to organizations operating within the country.
What are the largest internet providers in Czechia?
The top organizations in Czechia by IP allocation include the major ISPs, hosting providers, and enterprises listed above. These 50 organizations collectively manage the majority of the country's IPv4 address space.
How many ASNs operate in Czechia?
Czechia has 50 or more registered Autonomous Systems. Each ASN represents an independently routed network, such as an ISP, cloud provider, or enterprise network.
What continent is Czechia in?
Czechia is located in Europe. IP address allocations in this region are managed by RIPE NCC.
