ICCID check digit

Client

When the last ICCID digit fails Luhn, the body digits may still be correct. This page shows the trailing check digit that would make the string valid—useful after OCR or manual retyping.

Privacy: digits are evaluated only inside your browser. There is no carrier, GSMA, or SM-DP+ query—format math only. Treat SIM identifiers like any sensitive operational paste.
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The ITU‑T E.118 layout follows ISO/IEC 7812 for card identifiers: a Major Industry Identifier (telecom ICCIDs usually start with 89), an issuer/country/account block, then a trailing Luhn mod‑10 check digit using the same doubling rule as many payment PAN validators. Printed cards commonly show 18–22 digits; issuers pin one length profile per range.

Result

Passes Luhn mod 10 on the full 19-digit string.

  • MII (first 2): 89
  • Issuer / account core (between MII and check): 3530012345678901
  • Check digit (last): 1

Common use cases

  • Fix one wrong last digit in inventory without re-scanning the card.
  • Document expected check digit in QA specs.

Common mistakes to avoid

  • Changing the check digit without verifying the issuer block

    Luhn fix does not prove the middle digits belong to your carrier range.

FAQ

How is the ICCID check digit calculated?

Luhn mod-10 on all digits including the trailing check position.

Which digit is the check digit?

The last decimal digit of the ICCID string.

Common search terms

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

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