You can get bank name and brand color by IIN — first 4-6 digits of a card number. For example, 539123 gives you Revolut bank's data.

You can also get a card issuer like Visa or Mastercard by entering the full (12-16 digits) card number. But don't worry, there's no need to use your real card, you can replace all digits starting from 7th with any other digit like 0. For example, 4003 6100 0000 0000 is detected as Visa.

🙅🏻‍♀️Banks DB demo page does not collect card numbers or use them in any other way.