About the data
katalogisp.cz is an independent tool built on public data from the Czech Telecommunication Office (ČTÚ). We are not a comparison site paid for by providers; no one buys a better position with us.
Where the data comes from
Two ČTÚ sources:
- Register of entrepreneurs in electronic communications - who is authorised to provide internet and other electronic communication services in the Czech Republic (IČO, registered office, legal form, offered services, certificates).
- VPortal ESD (electronic collection questionnaires) - geodata of actual coverage for individual address points, which the Czech Telecommunication Office (ČTÚ) collects from providers under the law.
Source: https://data.ctu.gov.cz/sites/default/files/imports/import_podnikatele_2022/podnikatele_v_elektronickych_komunikacich.csv
Why the data correspond to the year 2025
The Czech Telecommunication Office (ČTÚ) collects coverage data once a year and publishes it with a delay, as verification and processing of the collection takes months. The 2025 data year is currently the latest available. The catalogue currently contains 1,499 internet providers.
How to report an error
Data on a specific company are taken from the ČTÚ registry as reported by the provider itself. If something is incorrect or missing for your company, write to us on the contact page - we will forward the suggestion or correct what is within our power.