Czech ccTLD, .cz WHOIS and eCommerce

Understanding the infrastructure behind the internet is essential for businesses and individuals alike, especially when it comes to navigating the complexities of country code Top-Level Domains (ccTLDs) like .cz for the Czech Republic. The .cz domain serves as a critical gateway for establishing a digital presence in this vibrant European country, known for its rich history, technological innovation, and burgeoning online marketplace. This article delves into the world of .cz Whois – a vital tool for domain research and management—exploring its significance, the role of the Czech registry in maintaining the integrity and accessibility of .cz domains, and the broader implications of ccTLDs on doing business online in the Czech Republic.

Whether you’re a local entrepreneur, an international company looking to expand, or simply curious about the digital landscape in the Czech Republic, understanding .cz Whois and the ecosystem around it is crucial. Join us as we unpack the essentials of .cz domains, from registration processes to navigating the legal and operational frameworks of the Czech internet space, ensuring you have the knowledge to thrive in this digital domain.

Why are we writing about this? We are exploring all 1500+ TLDs, and today it’s time for Czechia and ccTLD .CZ. Both our Domain Availability API and Whois API offer bulk checks, and in this article, we are going to show an example.

Image of digital collage that represents .cz Whois, Czech digital economy and Czech landmarks

Czech ccTLD and Its Position in The Global Economy

Country Code Top-Level Domains (ccTLDs) are internet domain name extensions that are specifically reserved for a country, sovereign state, or dependent territory. These two-letter domain extensions are defined by the ISO 3166-1 alpha-2 country codes and are delegated by the Internet Assigned Numbers Authority (IANA). Examples of ccTLDs include Czech’s neighbors .pl for Poland, and a country we wrote about yesterday .it for Italy. It’s the same around the World, .ca for Canada, .au for Australia, .br for Brazil and .jp for Japan.

ccTLD Popularity 2024

ccTLDs are part of the Domain Name System (DNS), which helps users navigate the internet by converting human-friendly domain names into the IP addresses that computers use to identify each other on the network. Each ccTLD is managed by a designated organization or registry within the corresponding country, which sets the rules and policies for registering domains under that ccTLD. These policies can vary widely from one ccTLD to another, reflecting the diverse legal, cultural, and linguistic environments in which they operate.

The use of ccTLDs is particularly important for businesses and entities wishing to establish a recognizable online presence in a specific geographical location. By using a ccTLD, a website can signal its target audience, enhance local search engine optimization (SEO), and potentially increase trust among local customers. Additionally, ccTLDs are often used for language-specific websites or as a strategic complement to a broader global online strategy involving generic top-level domains (gTLDs) like .com, .org, or .net.

Registered .cz domains
As of February 2024, there are around 1.5 million .cz domain names registered.

Understanding .cz Whois

“Whois” stands as a crucial protocol utilized to query databases that store the registered users or assignees of a domain name or an IP address block. When it comes to the .cz whois, which is the country code Top-Level Domain (ccTLD) for the Czech Republic, Whois takes on a pivotal role for individuals and businesses alike, seeking to establish or research a digital footprint within this vibrant European nation.

Below you can see an example of a Whois record in JSON output obtained with a Whois API. This means the data from the whois record is parsed and machine readable.

Who Manages .cz Whois?

The management and administration of the .cz ccTLD, including its Whois service, are overseen by CZ.NIC, the national registry for .cz domains. CZ.NIC is a non-profit organization that plays a vital role in maintaining the Czech Republic’s domain name infrastructure, ensuring operational stability, security, and development of the .cz domain space. This registry is responsible for registering domain names, managing the database of .cz domain registrations, and providing the public with access to Whois information for .cz domains.

The .cz domain was established in January 1993 by CZ.NIC. Why so late? On 31 December 1992, Czechoslovakia was peacefully dissolved, with its constituent states becoming the independent states of the Czech Republic and Slovakia. More on the Czech Republic later.

How Can .cz Whois Be Used?

The .cz Whois service is an invaluable tool for a variety of users and purposes:

  1. Domain Research and Registration: Individuals or entities looking to register a .cz domain can use Whois to check the availability of their desired domain name. If a domain is already taken, Whois provides information about the domain’s registration status, including the expiration date, which can be useful for planning future registration attempts.
  2. Contacting Domain Owners: Whois data includes contact information for domain registrants, making it possible to reach out for inquiries related to domain purchases, partnership opportunities, or resolving domain-related issues.
  3. Legal and Cybersecurity Investigations: Whois data can assist in legal investigations, intellectual property disputes, and cybersecurity efforts by revealing the identities behind .cz domains involved in fraudulent, spamming, or malicious activities.
  4. Market Research: Businesses and analysts can use .cz Whois data to understand market trends, track competitors, and identify potential business opportunities within the Czech Republic.
  5. Domain Management and Monitoring: Corporations can track domain expiration dates for all their domains and prevent unintentional domain name expirations.

Privacy and Accessibility of .CZ WHOIS

It’s important to note that the accessibility of Whois information may be subject to privacy regulations, such as the General Data Protection Regulation (GDPR) in the European Union. As a result, CZ.NIC, like other registries, may redact certain personal information from publicly available Whois records to comply with privacy laws while still providing sufficient details for legitimate purposes.

The .cz Whois service is a critical resource for anyone looking to navigate the digital landscape of the Czech Republic. Managed by CZ.NIC, this tool facilitates a range of activities from domain research to legal compliance, embodying an essential component of the internet’s infrastructure in the Czech Republic. Whether you’re a local entrepreneur, an international business, or a cybersecurity expert, understanding and utilizing .cz Whois can empower your online endeavors in this dynamic European market.

.cz Whois example

This JSON Whois record provides detailed information about the domain “,” which is registered under the .cz country code Top-Level Domain (ccTLD) for the Czech Republic. Here’s a breakdown of the key details from the record:

  • Domain Name: The domain in question is “”
  • Whois Server: The Whois information is served by “,” indicating that CZ.NIC manages the Whois service for .cz domains.
  • Registration Status: The domain is registered, and it is not marked as a premium domain.
  • Domain Status: The array for domain status is empty, suggesting no specific status flags (like “locked” or “pending delete”) are applied to this domain at the moment.
  • Registration Dates: The domain was created on July 10, 1997, and last updated on October 23, 2018. It is set to expire on October 24, 2024.
  • Contacts: Due to the General Data Protection Regulation (GDPR), personal details for registrant, admin, and technical contacts are disabled. This reflects privacy compliance measures to protect personal information. The country for the contacts is listed as “CZ” (Czech Republic), which is consistent with the domain’s ccTLD.
  • Nameservers: The domain uses three nameservers: “,” “,” and “” These are likely part of a hosting or domain registration service providing DNS management for “”
  • Disclaimer: The record includes a disclaimer from CZ.NIC, outlining the intended use of the data provided, emphasizing that it’s meant for purposes connected with internet network administration, legal proceedings, or similar processes.
  • Privacy and GDPR Compliance: The record demonstrates strict adherence to GDPR, with all potentially sensitive personal information being redacted to protect privacy.
  • Additional Information: The record also notes that it was cached on February 27, 2024, indicating the data was recently accessed and stored temporarily for efficiency. There are 28 requests available, possibly referring to a limit on the number of Whois queries that can be made within a certain timeframe.

This Whois record is a typical example of how domain information is managed and presented in compliance with privacy regulations like GDPR, while still providing essential details for administrative, legal, and technical purposes related to the domain.

Overview of the Czech Republic Economy and Digital Landscape

The Czech Republic, a sovereign country in Central Europe, is known for its rich history, cultural heritage, and beautiful landscapes, ranging from lush forests and rolling hills to historical cities like Prague, its capital. It is a member of the European Union (EU), having joined on May 1, 2004, as part of the EU’s largest single expansion. Despite its EU membership, the Czech Republic does not use the euro as its currency; instead, it maintains its own currency, the Czech koruna (CZK).

The modern nation of the Czech Republic was established on January 1, 1993, following the peaceful dissolution of Czechoslovakia. We mention this because it explains why .CZ domain and .CZ Whois was established in 1993. (compared to United States’ .US which was established in February 1985). This marked the Czech Republic’s emergence as an independent entity, separate from Slovakia, with which it had shared a common federal government since the creation of Czechoslovakia in 1918. Naturally, Slovakia established its own ccTLD, which we covered in a separate article.

Prague, Czech Republic, photo taken from Charles Bridge
Prague, Czech Republic, photo taken from Charles Bridge

Doing business online in the Czech Republic offers a dynamic and promising environment. The country boasts a high internet penetration rate and a well-developed telecommunications infrastructure, facilitating digital entrepreneurship and e-commerce. The Czech government supports the digital economy through various initiatives, aiming to enhance the country’s digital infrastructure, cybersecurity, and online services. This conducive digital environment has led to the growth of e-commerce, IT services, and tech startups.

The strongest industry in the Czech Republic is traditionally manufacturing, particularly in the automotive sector. The country is one of the leading automobile producers in Central Europe, hosting several major global manufacturers that have established significant production facilities there. Besides automotive, the Czech Republic has a strong industrial base in machinery, chemicals, and electronics. However, in recent years, there has been a noticeable shift towards a more diversified economy, with significant growth in the services sector, including information technology, financial services, and tourism, reflecting the country’s evolving economic landscape and increasing integration into the global economy.


Goran Duskic has been the Founder and CEO of WhoAPI Inc. since 2011, a company that specializes in developing APIs, including the well-known Whois API. He started his career in internet entrepreneurship in 2006 and has co-founded several online businesses, including a web hosting company that he later sold. Goran's work primarily involves creating practical API solutions to meet technological needs.