IMEI format validator

Client

IMEI format validator emphasizes structure over colloquial check phone wording. Paste digits to see length class, Luhn result, and TAC/serial breakdown—no GSMA or carrier directory lookup.

IMEI segment layout (15-digit)

TAC (8 digits) + serial (6 digits) + Luhn check digit (1 digit). IMEISV adds a software version field—do not blindly truncate to 15 digits.

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 format validator on mixed-length CSV exports from legacy tools.
  • Document expected layout for compliance training decks.
  • Filter malformed rows before SQL bulk insert.

Common mistakes to avoid

  • Expecting format validator to decode manufacturer name

    TAC hints are structural—no live TAC database query here.

  • Rejecting 14-digit bodies that omit check digit

    Classify length first—synthesize 15th digit when appropriate.

  • Treating format pass as proof device is genuine

    Luhn can pass on any syntactically valid string— not authenticity proof.

FAQ

What IMEI formats are valid?

Standard GSM IMEI is 15 decimal digits with valid Luhn; IMEISV is typically 16 digits.

Does format validation work offline?

After the page loads, pasted digits process locally.

What is TAC in IMEI format?

Type Allocation Code—the leading segment identifying model family in GSMA 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.