If it is a card of China Merchants Bank, it is suggested to check the card number in the following ways: 1. If you have registered as "a Netcom user", you can log in and check your own bound card number; 2. I hold a valid account opening certificate and print the "account certificate" at the counter of the nearest China Merchants Bank to obtain the card number; 3. If you apply for online banking professional edition and the cards can be associated, you can query the payer's card number through "All-in-One Card"-"Self-service Transfer"-"Peer Transfer"; 4. Log in to mobile banking and select Transfer-QR Code Transfer. There is a complete card number (version 4.2) under the QR code.