United KingdomNational Insurance Number
Also known as: NINO
Specification
Format
This number has no simple display mask — its structure is defined by validation rules. See the references below for details.
- Length
- 9 characters
- Checksum
- No
Only the format is checked — this number has no check digit.
- Embedded data
- No
This number encodes no extractable personal data.
Sample test value
PH235126MThis 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 United Kingdom National Insurance Number now — it runs in your browser and the number never leaves your device.
Try it in the validatorValidation rules for United Kingdom come from the open-source idnumbers library. Report a format issue on GitHub