ICCID duplicate detection

Client

ICCID duplicate detection combines batch Luhn validation with manual review of repeated lines in your paste. Warehouse merges and supplier files sometimes contain duplicate serials—catch format errors and obvious duplicates before CMDB or WMS ingest.

Duplicate hunt workflow

Paste full column. Note Luhn failures. Export or sort in your tool of choice to find identical normalized strings. Quarantine duplicates before activation.

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

  • Review supplier files where the same ICCID appears on multiple rows.
  • Pre-check merged CSVs from two scan stations.
  • Document QA: no duplicate ICCIDs in a shipment batch.

Common mistakes to avoid

  • Assuming this page auto-highlights duplicates in UI

    Use batch results plus sort/uniq in your spreadsheet—Luhn runs per line here.

  • Treating duplicate ICCID as always fraud

    Often a merge error—confirm with source files.

  • Ignoring failed Luhn rows when hunting duplicates

    Fix checksum errors first—typos can mimic duplicates.

FAQ

How do I detect duplicate ICCIDs?

Paste all serials, review batch output, then dedupe in Excel or your WMS.

Does duplicate ICCID mean invalid SIM?

Not necessarily—often a data entry or export mistake.

Can I paste hundreds of lines?

Yes within browser limits—one ICCID per line.

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.