CZ.NIC, z.s.p.o, is an interest association of legal entities, founded in 1998 by leading providers of Internet services in the Czech Republic. The principal duties and activities of the association include operation of the .CZ domain registry and DNS servers for the .CZ top-level domain (TLD).

The annual domain report is an on-line publication that offers key statistical facts about the status and dynamics of the Czech country-code TLD (ccTLD), which is primarily used by subjects in the Czech Republic – individuals and organisations.

The graphs and tables are organised into several sections illustrating various aspects of the registry and domain operation. Most charts are interactive: additional information can be obtained by placing the mouse cursor over graphical components of such a chart. In multivariate graphs, each variable can be switched off or on by clicking on the corresponding entry in the legend.

Domain reports from previous years are available from this page.

Domain .CZ in a nutshell

As a country code TLD, the domain .CZ is primarily used by Czech subjects – individuals and organisations. By the end of 2019, almost 1.33 million second-level domains were registered under .CZ. The following time series shows a characteristic S-shaped growth of the .CZ domain in the last two decades. A relatively slow start was followed by a period of an accelerated increase in domain counts. Since 2015, however, the curve clearly becomes saturated and will likely stagnate in the near future.

Domain geography

DNS domains live in the cyberspace, but they also have several links to the earthly geography. One of them is the address of the domain holder, as indicated in the .CZ registry. Naturally, most domain holders (1.23 million, i.e. 93%) have Czech addresses. The following table shows their distribution among 14 regions of the Czech Republic and also, which is perhaps more interesting, the number of domains per 100 citizens in each region. The map on the right shows the regional distribution of domain holders graphically.

Region Domains Domains per 100 citizens
Praha 403,453 30.6
Jihomoravský 149,736 12.6
Středočeský 123,937 9.0
Moravskoslezský 93,962 7.8
Zlínský 54,861 9.4
Jihočeský 52,565 8.2
Ústecký 49,311 6.0
Pardubický 46,579 8.9
Královéhradecký 46,459 8.4
Olomoucký 45,053 7.1
Plzeňský 40,167 6.8
Liberecký 36,304 8.2
Vysočina 34,939 6.9
Karlovarský 15,232 5.2
Unknown 41,197 NA

Approximately 7% of .CZ domains (exactly 94,062) have holders with addresses in countries outside the Czech Republic. Top ten of them are shown in the table below. It is not surprising that most foreign holders are based in Slovakia – till 1992 we shared the top-level domain .CS with our Slovak friends.

Country Domains
SK
SK
 Slovakia 23,309 23309
DE
DE
 Germany 15,907 15907
US
US
 United States 9,328 9328
GB
GB
 United Kingdom 5,331 5331
PL
PL
 Poland 4,785 4785
NL
NL
 Netherlands 4,433 4433
FR
FR
 France 4,218 4218
CN
CN
 China 2,704 2704
CH
CH
 Switzerland 2,633 2633
AT
AT
 Austria 2,308 2308
Others 19,522 19522

The following zoomable map captures world-wide distribution of .CZ domain holder addresses. Interestingly enough, some .CZ domains are registered in countries like El Salvador, New Caledonia, Madagascar, and even Antarctica!