DenmarkPersonal Identity Number
Also known as: personal identity number · CPR · Det Centrale Personregister
Specification
Format
This number has no simple display mask — its structure is defined by validation rules. See the references below for details.
- Length
- 10 characters
- Checksum
- No
Only the format is checked — this number has no check digit.
- Embedded data
- Yes
A valid number encodes details such as birth date, gender, or region. The validator extracts them locally in your browser.
Sample test value
3107146102This value was randomly generated to satisfy the format and check-digit rules. It is not a real ID and does not belong to any person.
Ready to check a number?
Validate a Denmark Personal Identity Number now — it runs in your browser and the number never leaves your device.
Try it in the validatorValidation rules for Denmark come from the open-source idnumbers library. Report a format issue on GitHub