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BIN 521431 — Lookup & Card Details
Check bank, country, card type, and issuer information for BIN 521431.
What is BIN 521431?
BIN 521431 is issued by S1lk Pay Ltd, from Kazakhstan, on the Mastercard network, as a prepaid 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 521431, that institution is S1lk Pay Ltd in Kazakhstan. The card runs on the Mastercard network. Transactions settle in KZT.
Mastercard is a global network whose BINs fall in the 51–55 and 2221–2720 ranges, accepted at merchants worldwide.
Payment processors read these digits on every transaction: they drive routing decisions, currency handling at checkout, fraud scoring and card-product acceptance rules. BIN 521431 carries no personal information: it maps to an issuing institution and card program, never to an individual account or person.
BIN 521431, digit by digit
Each position in a BIN carries defined meaning under ISO/IEC 7812. Here is how the 6 digits of 521431 break down.
BIN 521431 — frequently asked questions
Which bank issued BIN 521431?
BIN 521431 is registered to S1lk Pay Ltd in Kazakhstan. The issuing institution is recorded in the card networks' BIN registries and confirmed by the live lookup on this page.
What country is BIN 521431 from?
BIN 521431 was issued in Kazakhstan, where card transactions settle in KZT. Country of issuance is set by the issuing institution's registration, not by where the card is used.
What card network does BIN 521431 run on?
BIN 521431 runs on the Mastercard network as a prepaid card (Mastercard Prepaid Non Us General Spend). Mastercard is a global network whose BINs fall in the 51–55 and 2221–2720 ranges, accepted at merchants worldwide.
Is it legal to look up BIN 521431?
Yes. BIN 521431 is public infrastructure data under the ISO/IEC 7812 standard — it identifies the issuing program, not any cardholder. No personal or account data is involved in a BIN lookup.
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