The Bank Identification Number (BIN) 521774 is issued by VIETNAM THUONG TIN COMMERCIAL JOINT STOCK BANK in VIET NAM. This is a MASTERCARD DEBIT card with PREPAID RELOADABLE level.
BIN (Bank Identification Number), also known as IIN (Issuer Identification Number), refers to the first 6 digits of a payment card number. These digits identify the card-issuing institution, card type, and other attributes used for routing and fraud prevention.
By looking up BIN 521774, you can determine: the card network (MASTERCARD), whether it's a credit, debit, or prepaid card (DEBIT), the card level (PREPAID RELOADABLE), the issuing bank (VIETNAM THUONG TIN COMMERCIAL JOINT STOCK BANK), and the country of issuance (VIET NAM). This information is useful for payment processors, merchants, and fraud prevention systems.