Token Format Checker
Paste a token, card number or vault ID to see what its format does — and does not — tell you: Luhn, network by leading digits, valid length, masking limits, and whether it looks like a card or network token, a custom token or an opaque vault reference.
Follows ISO/IEC 7812-1 Luhn and IIN ranges · RFC 9562 UUIDstoken and card-number format checks·verified Oct 2026· double-checked Oct 2026
Try it as a puzzle: bill a subscriber with a stored network token →
Checked in your browser only. Use test card numbers, never real ones.
Network tokens from Visa, Mastercard and Amex use each network's normal number ranges and pass Luhn, so a token and a card number look the same; only the network's BIN table flags token ranges. Custom tokens are free-form: many keep the BIN and last four but fail Luhn on purpose. Make them with the Custom Token Generator, and read about both kinds in the merchant tokens and custom tokens guides.