---
id: "cz_ico"
kind: "datatype"
status: "stable"
is_pii: false
categories: ["companies"]
country: ["CZ"]
langs: ["cs"]
quality: 90
url: "http://registry.apicrafter.io/datatype/cz_ico"
---

# Czech business identification number (IČO) (`cz_ico`)

Identifikační číslo osoby (IČO), the eight-digit number that identifies a company, cooperative, association, public body or self-employed person in the Czech Republic. It was introduced on 1 January 1990. Registry courts assign it to companies, trade licensing offices to self-employed persons, and the Czech Statistical Office to the remaining economic subjects. Older, shorter numbers are padded with leading zeros. The last digit is a check digit (weights 8 to 2, modulo 11). Numbers can be looked up in ARES, the register of economic subjects. The DIČ of a legal entity is CZ followed by its IČO. ORG-ID.guide lists the register as CZ-ICO; with that prefix an identifier reads CZ-ICO-28179609.

- Personal data (PII): no
- Categories: Companies/business/organizations (companies)
- Countries: Czechia (CZ)
- Languages: Czech (cs)
- Classification: identifier

## Detection

Regular expression (Python `re`):

```
^[0-9]{8}$
```

Check digit algorithm: `cz_ico`

## Examples

- `28179609` — example from ORG-ID.guide
- `74750542` — example from ORG-ID.guide
- `01146131` — example from ORG-ID.guide
- `45274649` — ČEZ Group, an example of Wikidata P4156
- `00426547` — Czech Red Cross, an example of Wikidata P4156
- `00022985` — Ministry of Education, Youth and Sports, an example of Wikidata P4156
- `25596641` — Example of the check digit calculation in Czech Wikipedia
- `25596642` (invalid example) — Check digit does not match
- `2559664` (invalid example) — Seven digits; leading zeros must be kept

## Mappings

- orgid: `CZ-ICO`
- wikidata: `P4156`

## Translations

- cs: Identifikační číslo osoby (IČO): Osmimístné identifikační číslo právnické osoby, podnikající fyzické osoby nebo orgánu veřejné moci; poslední číslice je kontrolní.
- ru: Идентификационный номер организации Чехии (IČO): Восьмизначный номер компании, учреждения или индивидуального предпринимателя в Чехии; последняя цифра контрольная.

## Sources

- doc: <https://ares.gov.cz/>
- other: <https://org-id.guide/list/CZ-ICO>
- wikipedia: <https://cs.wikipedia.org/wiki/Identifika%C4%8Dn%C3%AD_%C4%8D%C3%ADslo_osoby>
- wikidata: <https://www.wikidata.org/wiki/Property:P4156>

## Quality

Score 90/100. Missing: detector coverage.

JSON: <http://registry.apicrafter.io/api/v1/datatypes/cz_ico.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/CZ/companies/cz_ico.yaml>