BIN 550443
www.natwest.com
5504 4353 6323 2487
BIN 550443 is the Issuer Identification Number (IIN) at the start of a card number. It is issued on the Mastercard network as a credit card. The issuing bank is National Westminster Bank PLC, based in United Kingdom. A BIN identifies the bank and card range only — it never reveals an account number, balance or cardholder.
Card number format for this BIN
Every card number that starts with 550443 follows these Mastercard rules. Its last digit is a Luhn check digit calculated from the digits before it, which is why a mistyped number is usually rejected before a payment is even sent.
🇬🇧 Our dataset lists 7,554 BIN ranges issued in United Kingdom. See the United Kingdom BIN list with its banks, card schemes and card types.
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Open BIN Lookup →Frequently asked questions
What bank issued BIN 550443?
BIN 550443 belongs to National Westminster Bank PLC in United Kingdom. A BIN identifies the issuing bank and card range — never an individual account or cardholder.
Is BIN 550443 a credit or debit card?
It is a credit card on the Mastercard network.
Can I get full card numbers from a BIN?
No. A BIN is only the first 6–8 digits and public routing information. It reveals the scheme, type, bank and country, but never a full card number, balance or cardholder. The sample on this page is randomly generated and holds no funds.