BIN 521900 — Lookup & Card Details

BIN 521900 is issued by Sumitomo Mitsui Card Company, Limited, from Japan, on the Mastercard network, as a credit card.

A Bank Identification Number (BIN, or Issuer Identification Number / IIN) is the first 6 to 8 digits of any payment card. It tells the payment network which institution issued the card, what kind of card it is, and where it was issued. For BIN 521900, that institution is Sumitomo Mitsui Card Company, Limited in Japan. The card runs on the Mastercard network. Transactions settle in JPY.

Mastercard is a global network whose BINs fall in the 51–55 and 2221–2720 ranges, accepted at merchants worldwide.

Merchants, fraud teams, ad platforms and developers use BIN data to route transactions, localize checkout, detect chargebacks and decide which card products they accept. BIN 521900 itself is public metadata — it identifies the issuer, not the cardholder.