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Is my site blocked in Czechia?
Czech internet providers must block websites that state bodies put on official lists, mainly for unlicensed gambling (Ministry of Finance), illegal medicine sales (State Institute for Drug Control, SÚKL) and unsafe food (Czech Agriculture and Food Inspection Authority, SZPI). The Ministry of Finance's gambling guidance accepts blocking in DNS (the internet's address book) and rules out blocking by IP address (a server's numeric address, which many sites share), so we think the main risk for a business is being put on a list itself. The Czech Telecommunication Office (ČTÚ) publishes these lists in one free register.
Sources: Ministry of Finance guidance, 2 April 2024 · SÚKL, November 2026 · SZPI, 30 September 2022 · Ministry of Finance list, 9 November 2026 · ČTÚ register, 10 November 2026
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Which authorities can get a site blocked in Czechia?
Under the gambling act (Act No. 186/2016 Coll., as amended), the Ministry of Finance lists websites, apps and payment accounts used to run gambling without a Czech permit. SÚKL has listed websites offering medicines in breach of the medicines act since 1 January 2022, and a separate list covers veterinary medicines. SZPI has listed sites offering unsafe food since 1 October 2022. For the gambling, medicines and food lists, providers have 15 days to put the block in place.
Sources: Act No. 186/2016 Coll., §§ 84a to 84d · SÚKL, November 2026 · SZPI, 30 September 2022 · ČTÚ, open internet page, November 2026 · ČTÚ register, 10 November 2026
EU sanctions against Russian state media such as RT and Sputnik also apply to Czech telecom companies. ČTÚ publishes no list of the sites concerned: it says it "is not authorized to issue any lists of specific sites to block". Under Czech national sanctions, the government put the Prague company Voice of Europe on its sanctions list on 27 March 2024, and providers must block voiceofeurope.com and voiceofeurope.eu.
Source: ČTÚ, open internet page, November 2026
How do Czech providers block a listed site?
The gambling act does not say how providers must block a listed site. The Ministry of Finance's guidance for providers rules out IP blocking, because it would also block domains of other owners. If a provider redirects visitors, the guidance recommends sending them to the Ministry's list page or showing a notice that a Ministry decision blocked the site. In March 2022 SÚKL told the ICT industry association VNICTP that it lists only sites whose entire content is illegal, so that whole domains can be blocked in DNS. It said shops that also sell legal goods are not on the list, and that it deals with them under its other powers in the medicines act.
Sources: Ministry of Finance guidance, 2 April 2024 · VNICTP, 21 March 2022
Before the Ministry of Finance adds a site to the gambling list, it publishes a notice of intent, and the site's operator has 15 days to object. After a site comes off the gambling list, providers have up to 15 days to lift the block. Lists can be wrong: the first version of ČTÚ's register, in January 2026, included ČTÚ's own website.
Sources: Act No. 186/2016 Coll., §§ 84a, 84e and 84f · Lupa.cz, 2 January 2026
Which sites besides casinos end up on Czech lists?
Since 1 January 2024 the Ministry of Finance can also list sites and apps whose substantial purpose is to cause, enable, facilitate or conceal illegal gambling. Its guidance cites marketplaces, review portals and discussion forums. The Ministry's list of 9 November 2026 already includes sites listed for this reason. It also lists the prediction markets polymarket.com (listed on 13 July 2026) and kalshi.com (listed on 30 September 2026) as illegal gambling. The Czech tech news site Lupa.cz reported on 2 October 2026 that kalshi.com no longer opened on Vodafone's home internet (fixed line).
Sources: Ministry of Finance guidance, 2 April 2024 · Act No. 186/2016 Coll., §§ 84a and 84c · Ministry of Finance list, 9 November 2026 · Cnews.cz, 17 July 2026 · IPRH, 1 October 2026 · Lupa.cz, 2 October 2026
SZPI can also list a site whose content seriously breaks other rules it enforces. A Czech law firm wrote in 2023 that SZPI decides at its own discretion what counts as serious, and that this can reach e-shops whose food supplements are wrongly labelled.
Sources: SZPI, 30 September 2022 · Advokátní kancelář legato, 7 July 2023
Can a Czech provider block a site without a legal order?
On 25 February 2022, right after Russia invaded Ukraine, CZ.NIC, which runs the .cz domain, made the domains of eight websites accused of spreading disinformation unreachable. It acted after consulting state authorities and said it would lift the block on 25 May. On 1 March 2022 the Association of Mobile Network Operators, whose members are O2, T-Mobile and Vodafone, announced that they would block six more websites labelled as pro-Russian disinformation. They were answering an appeal from the government, followed by a request from the military's National Cyber Operations Centre.
Sources: Radio Prague International, 24 May 2022 · Lupa.cz, 1 March 2022
T-Mobile also blocked the website AC24.cz from 28 February to 28 June 2022, acting on a government resolution and a letter from the National Cyber Operations Centre of military intelligence. On 25 June 2026 the Municipal Court in Prague confirmed that this broke the EU's open-internet rules (which limit when providers may block sites), because neither document was a binding order. It also rejected T-Mobile's argument that a block in its DNS service is not a block of internet access. It confirmed CZK 34,593.90 in lost profit for the site's operator and said no further appeal is allowed. So blocking on a mere request can cost a Czech provider damages.
Sources: Municipal Court in Prague, judgment 20 Co 158, 159/2026, 25 June 2026 · ČTÚ, open internet page, November 2026
How can I check whether my site is blocked in Czechia?
Search ČTÚ's single list of blocked websites. Since January 2026 it has combined the gambling, medicines, veterinary and food lists. It is free and needs no registration, and you can download it as a spreadsheet (CSV or XLSX). As of 10 November 2026 it held 4,266 records, including sites since removed. It is meant to update every evening at 23:00, but an update can fail, so for the newest entries also check the authorities' own lists. The authority that listed a site, not ČTÚ, is responsible for the entry. If the register does not match that authority's list, you can tell ČTÚ through its contact form.
Sources: ČTÚ register, 10 November 2026 · ČTÚ FAQ, December 2025 · Lupa.cz, 2 January 2026
To see a gambling listing coming, follow the Ministry of Finance's notices of intent. As of November 2026 the register does not include blocks under EU sanctions or Czech national sanctions, such as voiceofeurope.com and voiceofeurope.eu. Our note explains why uptime monitors, which check from data centers, can miss blocks like the Kalshi block on Vodafone's home internet.
Sources: ČTÚ register, 10 November 2026 · ČTÚ, open internet page, November 2026
We do not measure Czechia yet; demand decides the order in which we add countries. A check there would have to cover sites on ČTÚ's register and sanctions blocks such as voiceofeurope.com, provider by provider. As of 11 November 2026, linkspect is open in early access in Germany, Poland and Norway.
Facts checked on 11 November 2026.