Icelandic ID & Company Registration Number Calculator (Kennitala)
Instantly validate Icelandic personal and corporate ID numbers (Kennitala) with the official Modulo 11 checksum formula. Determine entity type (individual vs. company), birth or incorporation date, century, and look up registered companies in Skatturinn's official directory.
How Does the Icelandic Kennitala System Work?
The standard Icelandic national identification number consists of exactly 10 digits formatted as: DDMMYY-RRSC
- DDMMYY: Date of birth for individuals (DD: 01–31) or incorporation date for corporations (40 is added to DD, resulting in 41–71).
- RR: Random two-digit sequencing numbers assigned upon registration.
- S (9th digit): Modulo 11 security checksum digit (varnartala).
- C (10th digit): Century indicator (9 = 1900–1999, 0 = 2000–2099, 8 = 1800–1899).
Weights: [3, 2, 7, 6, 5, 4, 3, 2] applied to the first 8 digits
Checksum Digit = 11 - (Sum mod 11). If remainder = 0, Checksum = 0. If remainder = 1, number is invalid.
Frequently Asked Questions About Icelandic Kennitala (5 Answers)
How is an Icelandic Kennitala validated with the Modulo 11 algorithm?
The 9th digit of an Icelandic Kennitala is a checksum security digit calculated from the first 8 digits using the statutory weight vector [3, 2, 7, 6, 5, 4, 3, 2] divided by 11.
How do you distinguish a corporate Kennitala from an individual ID?
Corporate identification numbers (for companies, ehf., hf., and institutions) have a first digit between 4 and 7, because 40 is added to the incorporation day of the month.
What does the 10th digit in an Icelandic Kennitala signify?
The 10th digit represents the century of birth or incorporation: 9 indicates the 1900s (1900–1999), 0 indicates the 2000s (2000–2099), and 8 indicates the 1800s (1800–1899).
Can foreign residents receive an Icelandic Kennitala?
Yes. Foreign workers and residents obtain a system ID or permanent Kennitala via Registers Iceland (Þjóðskrá Íslands) or Skatturinn for tax and employment purposes.
Is this Kennitala validator connected to the official registry?
This client-side tool validates the mathematical Modulo 11 checksum and date structure, and provides a 1-click query link to look up registered companies directly in Skatturinn's Official Company Registry (Fyrirtækjaskrá).