If you want to find if some credit card number is a visa card - check the first numbers on the card.
The first 6 digits of a credit card number are code numbers of the issuing bank.
The number will show if it is a credit card number or a debit card number.
If the first digit of a credit card number is 4 - it means the credit card is Visa.
If the first digit is 5 - the credit card is MasterCard.

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