VIN mod 11 check

Client

VIN mod 11 check names the algorithm explicitly—distinct from Luhn mod-10 used on IMEI and payment cards. Paste a 17-character frame to run the published weight table.

Mod 11 vs other checksums

IMEI and ICCID use Luhn mod-10. VIN position nine uses sum of (transliterated value × weight) mod 11, with X representing remainder ten.

Privacy: parsing runs only in your browser. This page does not query DMV, insurance, or manufacturer databases—only the published mod-11 rule for the ninth character.
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After removing spaces and hyphens, the frame must be exactly 17 characters. Letters I, O, and Q are forbidden everywhere. Position 9 (index 8) is the check symbol: decimal 0–9 or X for remainder ten. Each symbol maps to a numeric value, is multiplied by a fixed weight for its position, products are summed, and sum mod 11 must equal the check symbol’s value (X → 10).

Result

Passes check digit — weighted sum mod 11 is 10; expected X.

  • WMI (positions 1–3): 1HG
  • Attributes (4–8): BH41J
  • Check (9): X
  • Model year code (10): M
  • Plant (11): N
  • Sequential (12–17): 109186

Common use cases

  • Cross-check engineering samples against spec documents.
  • Explain mod 11 vs Luhn when auditing mixed identifier CSVs.

Common mistakes to avoid

  • Applying Luhn doubling to VIN strings

    VIN uses fixed position weights and mod 11, not alternate digit doubling.

FAQ

Do VINs use mod 11 or Luhn?

North American-style VINs use mod-11 weighted sum for the check digit—not Luhn mod-10.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • vin check digit verifier online
  • validate vin number mod 11 free
  • ninth position vin checksum browser
  • iso 3779 vin check digit calculator
  • vehicle identification number check digit locally

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