The Bank Identification Number (BIN) 558421 is issued by CHINA CITIC BANK INTERNATIONAL LIMITED in HONG KONG. This is a MASTERCARD CREDIT card with BUSINESS 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 558421, you can determine: the card network (MASTERCARD), whether it's a credit, debit, or prepaid card (CREDIT), the card level (BUSINESS), the issuing bank (CHINA CITIC BANK INTERNATIONAL LIMITED), and the country of issuance (HONG KONG). This information is useful for payment processors, merchants, and fraud prevention systems.