Validate Organization Number
Check if a Swedish organization number is correct using the Luhn algorithm.
Checksum validation verifies the number format is correct. It does not confirm the company exists or is active.
Frequently Asked Questions
What is the check digit in an organization number?
The check digit is the last digit in the organization number. It is calculated using the Luhn algorithm (modulus 10) based on the first nine digits.
What is the difference between a personal number and an organization number?
Organization numbers always have a third digit of 2 or higher. Personal numbers have a third digit of 0 or 1. Sole proprietorships use the owner's personal number as their organization number.
Can I validate without querying Bolagsverket?
Yes. Checksum validation only checks that the number format is correct. It does not prove the company exists or is active. Use our company search to verify against the register.
How does the network view work?
The network view shows connections between companies sharing the same registered address. Run a batch search with multiple organization numbers and a graph is drawn automatically. Note that a shared address does not imply ownership or legal connection.
What does connection via address mean?
A connection via address means two or more companies share the same registered postal address at Bolagsverket. This can be due to shared office space, serviced offices, or other neutral reasons. It does not indicate ownership or control.
Want to analyze connections via address? Try the network view in the tool.