ICCID privacy-safe check

Client

ICCID privacy-safe check addresses teams who cannot send SIM serials to unknown web backends. All Luhn steps run client-side after page load—no login, no file upload, no GSMA query.

What stays local

Normalization, length checks, Luhn mod-10, MII readout, and suggested check digit—all computed in-browser. No carrier provisioning API is called.

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

  • Validate ICCIDs on air-gapped-ish desktops that still allow HTTPS tool pages.
  • Train privacy reviewers with a page that matches your no-upload policy.
  • Support macros linking to a client-side checker instead of opaque forms.

Common mistakes to avoid

  • Assuming privacy-safe means anonymous analytics never run

    See site privacy policy for general page metrics—your paste is not sent for Luhn.

  • Sharing prefilled agent links in public tickets

    Prefill URLs embed digits—use only in private channels.

  • Equating local check with legal compliance alone

    Your org may still restrict where SIM data may be viewed.

FAQ

Where are ICCID digits processed?

In your browser tab— not on Toolcore servers for validation math.

Is login required?

No.

Can I use this for regulated environments?

Local processing helps—confirm against your security review checklist.

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.