MEID Luhn mod 16

Client

MEID Luhn mod 16 applies when the body uses hexadecimal digits including A–F. Doubling and summing use radix 16—not the mod-10 path used for all-decimal bodies.

Mod 16 arithmetic

Each hex digit maps to 0–15. Doubled values at or above 16 reduce by subtracting 15. The check digit completes the sum modulo 16.

Privacy: checksum math runs locally in your tab. Toolcore does not query carrier or TIA MEID databases—format and Luhn check only.
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CDMA MEIDs appear as 14 hexadecimal digits plus an optional check digit (15 total), or as an 18-digit decimal form with its own check digit. Hex values containing A–F use Luhn mod‑16; all‑ decimal hex uses Luhn mod‑10—same family as IMEI on GSM handsets.

Result

GSM devices use IMEI instead—open IMEI checker when the label shows a 15-digit decimal identifier.

Passes MEID Luhn check for AF0123450ABCDEC (hex form).

Reporting body (RR)
AF
Hex compact
AF0123450ABCDE
Manufacturer code
012345
Serial number
0ABCDE

Common use cases

  • Validate engineering hex samples against 3GPP2 documents.
  • Explain why hex MEID differs from decimal IMEI Luhn.

Common mistakes to avoid

  • Using IMEI mod-10 calculator on hex MEID labels

    IMEI is decimal-only; hex MEID check uses mod-16.

FAQ

When does MEID use mod 16?

When the body is hexadecimal and contains A–F—or when validating the standard 14-char hex form.

Common search terms

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

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