JCB card check

Client

JCB cards use four-digit prefixes from 3528 through 3589 per open documentation, commonly 16 digits. Paste for Luhn validation and network heuristic—no JCB issuer lookup.

JCB IIN range

Toolcore matches the documented four-digit JCB range before falling back to unknown network. Length hint appears when digit count differs from common 16.

Sensitive data: checks run only in your browser. Prefer processor-published test card numbers, never live PANs on shared devices.
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Spaces and dashes are stripped before counting digits and running Luhn. Card-network labels come from common public BIN/IIN ranges—they may mismatch exotic co-branded or new ranges.

16 digits after cleanup

Likely network: Visa

Luhn checksum: passes — algorithm-only; does not mean the card is active or genuine.

Common use cases

  • Validate JCB test PANs in APAC-market QA matrices.
  • Flag non-JCB prefixes mislabeled in spreadsheets.

Common mistakes to avoid

  • Expecting JCB detection from first two digits only

    JCB heuristic needs up to four leading digits in the 3528–3589 window.

FAQ

How to identify JCB by number?

Prefix 3528–3589 with Luhn pass and typical 16-digit length.

Common search terms

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

  • credit card luhn check online
  • visa mastercard bin checker browser
  • payment card checksum validator no upload
  • validate primary account number luhn locally
  • discover amex prefix checker heuristic online

More tools

Related utilities you can open in another tab—mostly client-side.