Let's examine the anatomy of a credit card number and look at two ways to use Visa and Visa Electron: 13 or 16; Mastercard: 16; Discover: 16. Visa Electron is a debit card available across most of the world, with the exception of Canada, The card number and validity as well as cardholder name are printed rather than embossed, thus the card cannot be used in a card imprinter - for Owner : Visa Inc. All genuine Visa credit and debit cards comply with a specific number format and display a set of unique features that make them easy to validate. Debit card number This digit number is unique to your card. Where is the card number on my visa electron? It can't be used for online transactions. Interaction Help About Wikipedia Community portal Recent changes Contact page. These are European cards run over the Visa network.