IMEI check digit validator

Client

IMEI check digit validator focuses on the trailing Luhn digit—ideal when you trust the first 14 digits from a label scan. Paste full 15 digits or use the calculator companion for missing check digits.

When to use check digit validator

Use when forms fail Luhn but the label photo looks correct—often one digit was misread. Re-scan or apply the suggested digit, then re-run full IMEI validation.

Privacy: digits are parsed only in your browser—no carrier or GSMA lookup, no upload. Treat device identifiers like any sensitive paste on shared machines.
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A 15-digit IMEI is commonly described as eight-digit TAC + six-digit serial + Luhn check digit; the trailing digit should satisfy ISO/IEC 7812 mod 10 on the full string—same arithmetic as debit/credit PAN checks. A 16-digit IMEISVappends two software version digits instead of exposing the standalone check position; carriers may still relate it to IMEI numbering but this page stops at segmentation and does not certify assignment.

Result

Passes Luhn mod 10 on the 15-digit string.

  • TAC (8): 35693803
  • Serial (6): 564380
  • Check (1): 9

Common use cases

  • IMEI check digit validator after manual entry from worn labels.
  • QA scripts verifying check digit algorithm implementations.
  • Support desks explaining why a portal rejects pasted IMEI.

Common mistakes to avoid

  • Replacing check digit without re-reading the label

    Suggested digit is math-only—confirm against physical print when possible.

  • Validating check digit on IMEISV as 15-digit IMEI

    IMEISV uses a different layout—classify length first.

  • Assuming check digit pass means device is not cloned

    Luhn does not detect duplicate or cloned radios.

FAQ

How is IMEI check digit calculated?

ISO/IEC Luhn mod-10 on the preceding 14 digits for standard GSM IMEI.

What if check digit fails?

Look for transposed digits—this page shows the expected trailing digit.

Is check digit same as serial?

No—serial is six digits before the check digit in 15-digit layout.

Common search terms

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

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More tools

Related utilities you can open in another tab—mostly client-side.