List of .cz Zone Domains
.cz Domain Zone Datasets
Download a .cz domain name list or a full dataset with DNS, server IP, emails, and phone numbers.
Zone TLD: .CZ
Zone type: country-code (ccTLD)
Update frequency: monthly (last updated on September 10, 2026)
Total domains monitored: 1,048,781
Tracked domains included in datasets: 1,048,781
Datasets available:
Basic Domain List
(download sample 💾)
Detailed Domain Dataset (download sample 💾)
The vertical axis uses only this chart's value range so small changes over time are easier to see.
How many .cz domains are there?
As of September 10, 2026, the .cz domain list contains 1,048,781 tracked .cz domains, 0.287% of all domains tracked by NetAPI, which makes .cz the #35 largest of 1,584 zones. The list grew by +6,517 (+0.625%) over the last 30 days and by +104,612 (+11.1%) year over year.
Newly discovered .cz domains are added to the list daily, with a full refresh every one to two months (how updates work). 6,094 .cz domains are in the free NetAPI Top 1M. See the most popular .cz websites. 53 .cz domains are currently listed in the compromised domains feed (0.005% of the zone). See the TLD abuse report.
Frequently Asked Questions
See our FAQ for more answers.
Can I download sample datasets for the .cz zone?
Yes. Download a sample .cz domain list or a sample .cz dataset.
What is a basic domain list, and how does it differ from a detailed dataset?
Both cover the same 1,048,781 registered domain names in the .cz zone. A basic list is one domain name per line in a gzip CSV. A detailed dataset adds DNS servers, server IP, hostname, emails, phone numbers, and more. See the dataset format details.
How often are .cz datasets updated?
The .cz zone is a country-code (ccTLD) zone, and its registry zone file is not directly accessible. NetAPI discovers .cz domains through large-scale crawls: newly discovered domains are added to the list daily, and the full dataset is rebuilt every one to two months. See how updates work.
Can I download only newly registered .cz domains?
Not for this zone. Newly discovered .cz domains are merged into the active list daily, but there is no separate new-domains file for .cz. Daily new-domains lists exist for the zones marked as updated daily in the datasets catalog.
What format and size is the file?
Every .cz domain list and dataset is a CSV file compressed with gzip (.csv.gz):
the basic list has one domain name per line, the detailed dataset has one row per domain with the columns described in the
dataset format details.
Compressed, the current .cz basic list is about 5.8 MB and the detailed dataset about 17 MB.
Any archiver opens gzip files, for example the free
7-Zip on Windows,
and the API can also serve the files uncompressed (format=plain).
How do I automate daily downloads?
Schedule automatic downloads through the API. See the API documentation for authentication and endpoints.
Are emails and phone numbers available for every domain?
No. We collect contact details from public websites when available. Many domains have no published email or phone, and we do not guarantee these fields on every row. Do not use the data for unsolicited bulk outreach.
Additional .CZ Zone / Registry Information
Czech businesses and individuals prefer the .cz domain due to its local versatility and high availability. It is operated and managed by the non-profit organization, the CZ.NIC. This domain extension is highly relevant within the Czech market, with over 10 million registered domains.
The .cz domain has no registration restrictions and is available to anyone around the World. Businesses must provide their tax registration number to adopt this domain name extension. It has no other strict eligibility criteria and is accessible to all kinds of local or international companies and individuals.
Top DNS providers / .cz domain zone
Share of .cz domains by nameserver provider.
Chart Y-axis is scaled to the data range to show day-to-day changes (not from zero).
Based on this dataset and daily threat-intelligence signals. Domains may be listed after observed phishing, malware, spam, botnet, or similar activity; inclusion does not imply malicious intent by the owner, registrar, registry, or host. Updated daily; figures may change as new data arrives.
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