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The first four characters are what is known as the Bank Identification Number(BIN). Basically, it tells that Visa/MasterCard which bank issues the card. And how to route the transaction so it gets approved and posted. In order to be secure in online use virual credit card which is more secure for online transactions.

Q: What are the first four numbers of a visa?

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The first number is 4 for all visa cards. Rest of the numbers are based on the issuing bank, the routing number for the bank, the account number etc.

The security code on any credit card would be the last set of digits on back of the card with is the three digit number

The first four numbers in pi are 3.141. Backwards, the first four numbers are 141.3. Pi has been calculated to over a million digits.

Usually, a visa card has 16 numbers.

Credit card ID numbers have three (Discover, Visa, MasterCard) or four (American Express) digits.

Related questions

The first number is 4 for all visa cards. Rest of the numbers are based on the issuing bank, the routing number for the bank, the account number etc.

You can identify a credit card number if it is a VISA credit card number by looking at the first number which is number four and it has sixteen numbers.

the first four numbers are....... 3.141592654

how many numbers are on a visa card 16number of VISA

The first four PRIME numbers are 2,3,5,7. If you square these you get 4,9,25,49. The first four squared numbers could be 1,4,9,16

The security code on any credit card would be the last set of digits on back of the card with is the three digit number

The first four numbers in pi are 3.141. Backwards, the first four numbers are 141.3. Pi has been calculated to over a million digits.

Usually, a visa card has 16 numbers.

Credit card ID numbers have three (Discover, Visa, MasterCard) or four (American Express) digits.

The sum of the first four prime numbers is 17.

Visa always starts with a 4, mastercard with a 5. The first 4 numbers identify the bank.

1,3,5 and 7The first four odd numbers are 1, 3, 5 and 7. Odd numbers are not divisible by two.