Blocked Domains

We are an independent information portal providing a comprehensive and daily updated overview of websites that are blocked, regulated, or flagged as high-risk in the Czech Republic. Our goal is to increase internet transparency and help users browse safely.

We source the data required for the operation of this website exclusively from official and publicly accessible registers of Czech state institutions and authorities. Our primary sources include:

• CZ.NIC – the administrator of the Czech national top-level domain .cz (administratively dropped domains)
• CTIA - Czech Trade Inspection Authority (list of risky e-shops)
• MoF - Ministry of Finance of the Czech Republic (blacklist of unauthorized internet gambling websites)
• SUKL - State Institute for Drug Control (illegal offers of medicinal products)
• ISCVBM - Institute for State Control of Veterinary Biologicals and Medicines (internet sales of unauthorized veterinary medicines)
• CAFIA - Czech Agriculture and Food Inspection Authority (dangerous food products and misleading food supplements)

We update the domain lists every single day. We strive to reflect the latest changes in official registries as quickly as possible. However, in critical cases, we recommend verifying the domain status directly with the respective authority.

You can search by entering the full domain name (e.g., mujweb.cz), part of it, or you can filter by a specific institution (e.g., MoF, CTIA).

Unfortunately, no. New scam e-shops and phishing websites emerge every day. Our list is indicative and relies on how fast the authorities discover and blacklist a particular website. We always recommend exercising caution (e.g., checking store reviews before buying).

A domain can be blocked or suspended based on valid Czech legislation for several reasons:

• Incorrect or non-existent holder data: The CZ.NIC association suspends domains where the identity of the owner could not be verified.
• Law violation (fraud and illegal sales): Websites operating as scam e-shops, illegally selling prescription drugs, or running gambling operations without a Czech license.
• Security threats: Websites spreading malware, phishing, or being part of a botnet.
• Court or Czech Police decisions: Ordered as part of criminal proceedings.

In most cases, yes. If a domain is administratively removed from the DNS zone (e.g., for .cz domains via CZ.NIC), the website stops working globally. In the case of ISP-level blocking (e.g., for illegal gambling), access is blocked at the network connection level within the Czech Republic.

This status is most commonly assigned by the CZ.NIC association to .cz domains. It means that the domain holder failed to provide valid contact details or did not respond to an identity verification request. The domain is temporarily disabled, and if no correction is made, it will be deleted and released for public registration after the deadline.

Our portal only mirrors official data from the authorities and the CZ.NIC association. Once you fix the issue (e.g., updated your Whois registry data or were removed from the CTIA blacklist), your domain will automatically disappear from our website during the next daily update after the respective authority processes the change. There is no need to contact us, we do not edit the data manually.

Open the details of your domain in our search engine. For every record, we specify the exact source/authority (e.g., CTIA, SUKL, CZ.NIC) that decided to include it on the blacklist.

You must immediately contact your domain registrar or the CZ.NIC association directly and provide them with correct and valid holder data, or prove your identity. Once CZ.NIC verifies the data, the domain will be returned to the active DNS zone.

This designation mostly comes from the Czech Trade Inspection Authority (CTIA). It means that the e-shop either seriously violates the law (e.g., does not deliver paid goods, fails to communicate, refuses refunds) or anonymously misuses the identity of another company and lacks mandatory terms and conditions.

If you paid by card online, contact your bank immediately and request a chargeback (disputing the transaction due to fraud). If the e-shop does not communicate and the goods have not arrived, gather all communication and order receipts and consider filing a criminal complaint.

In addition to searching our database, look out for warning signs: extremely low prices compared to the market average, missing phone contacts and physical company address, poor Czech grammar (often machine-translated), and an absence of reviews on independent portals. Fraudulent e-shops also frequently parasite on famous brand names and use suspicious domain names.

SUKL blacklists websites when they offer prescription-only medicines for sale online without a prescription, or sell unapproved, counterfeit, or explicitly dangerous medical products. In the Czech Republic, legitimate pharmacies can only sell over-the-counter (OTC) drugs online under strict regulations.

Every approved pharmacy in the Czech Republic offering mail-order services must display the mandatory common European logo (a green logo featuring the Czech flag and a cross) on its pages. Clicking this logo must redirect you to the official SUKL registry, where you can verify the seller's authorization.

CAFIA orders the blocking or restriction of websites that offer health-hazardous food products, dangerous food supplements (e.g., containing banned substances), or websites that seriously mislead consumers (such as promising miraculous cures for diseases using ordinary food supplements).

Yes, the risk is extreme and directly concerns your health. Products from illegal websites do not undergo any quality, purity, or composition control. In the best-case scenario, you will receive an ineffective counterfeit; in the worst case, a product containing toxic or dangerous substances.

These abbreviations refer to specific laws of the Czech Republic. For example, Zhh stands for the Gambling Act (Zákon o hazardních hrách). The listed paragraphs specify the exact legal reason why the Ministry of Finance (MoF) ordered the blocking of the website (usually due to operating illegal gambling without a valid license).

This type of blocking (most commonly executed by the CZ.NIC association based on a request from the Police of the Czech Republic or the public prosecutor's office) concerns domains exploited for criminal activities. This typically includes severe cyberattacks, large-scale phishing campaigns targeting online banking, distribution of illegal content, or online scams.

Yes. If an attacker gains control over a legitimate website and starts spreading malware or phishing pages, the domain can be blocked for security reasons to protect other internet users. In this case, the legitimate owner must first completely clean and secure the website, and then request the blocking authority to review and unblock it.

We recommend using secure and validating DNS servers. In the Czech Republic, you can use the free CZ.NIC ODVR service (Open DNS Validating Resolvery), which automatically blocks access to websites evaluated as security threats.

Technically, ISP-level blockages can be bypassed, for example, by changing DNS servers or using a VPN. While bypassing it for personal use is not illegal itself, the user knowingly enters websites that state authorities have flagged as illegal, fraudulent, or dangerous (e.g., risking money loss at unlicensed casinos).

Although we update the data automatically every day, an error in transmission can rarely occur. If you notice a discrepancy, email us at admin@blokovanedomeny.cz and we will investigate the record. However, if the error lies directly within the official registry of the given institution, you must contact that specific authority.