Free tool
Swedish Organisationsnummer Check
Type a Swedish organisationsnummer and the check reports whether it is ten digits with a valid Luhn check digit. It looks only at the number, not the register. Bolagsverket is the Swedish register where the company is confirmed, and our free company search finds the company when you only have a name.
- 5 free checks a day
- No account and no API key
- Checked instantly in your browser
The result appears here. Nothing is stored, and the allowance is per visitor per day.
Example result
A well-formed organisationsnummer
- Organisationsnummer
- 5567037485
- Digits
- 10
- Luhn check digit
- Matches
- Verdict
- Well formed
- Where to confirm
- Bolagsverket
Spotify AB is a public example of this number shape in the Swedish register. This page vouches for the format only; Bolagsverket is where the company behind it is confirmed.
A real check above replaces this example.
What the check reads
- Ten digits
- Spaces and hyphens are stripped before the count. A number with letters fails, because an organisationsnummer has no letters.
- The written form
- The hyphen is often written before the last four digits, as in 556029-5197. It is formatting only, so the check accepts the number either way.
- The Luhn check digit
- The last digit is computed by the Luhn rule over the first nine. A mismatch means the number is not well formed, which usually points to a transposed pair.
- The lead digit
- The first digit groups the holder: 5 for a limited company, 6, 7, 8 and 9 for associations, foundations and similar. The check reads it for context but does not reject a valid number on it.
- What this does not check
- Whether the number was ever issued, which company holds it, and whether that holder is still active. That lives in Bolagsverket, not in the number.
Where the answer comes from
- Bolagsverket
The Swedish register. Every organisationsnummer this check accepts can be looked up here.
- Allabolag
An independent company directory, useful for a name search. It is not the register.
Worked examples
Example inputs and the results they return.
A well-formed organisationsnummer
- Organisationsnummer
- 5567037485
- Digits
- 10
- Luhn check digit
- Matches
- Verdict
- Well formed
- Where to confirm
- Bolagsverket
Spotify AB is a public example of this number shape in the Swedish register. This page vouches for the format only; Bolagsverket is where the company behind it is confirmed.
The same number in its written form
- Digits
- 10
- Hyphen
- Ignored
- Luhn check digit
- Matches
- Verdict
- Well formed
The hyphen before the last four digits is formatting, so it does not change the result.
A broken check digit
- Digits
- 10
- Luhn check digit
- Does not match
- Verdict
- Not well formed
- Likely cause
- Two digits transposed or one mistyped
Changing the final digit breaks the Luhn sum, so the number cannot be a real organisationsnummer.
FAQ