Credit Card Validator - Warning: ONLY use with FAKE numbers. We do not store any credit card numbers on this site. Use this only to check fake numbers for use in testing on your own website. Do NOT enter a real credit card number!

If you need to code a real credit card validator, please refer to the sample code below using Python.

How does a credit card validator work?

A credit card validator is a tool or a service that is used to verify the validity and the authenticity of a credit card. The credit card validator checks the credit card number against a set of rules and algorithms, and it determines whether the credit card number is valid or not. The credit card validator can also check the credit card number against a database or a registry, and it can verify the credit card number against the issuing bank or the credit card company.

The credit card validator uses different methods and techniques to validate the credit card number. For example, the credit card validator can use the Luhn algorithm, which is a mathematical formula that is used to check the validity of the credit card number. The Luhn algorithm checks the credit card number against a set of rules, and it determines whether the credit card number is valid or not based on the checksum of the number.

The credit card validator can also use other methods and techniques, such as the IIN (issuer identification number) check, the BIN (bank identification number) check, or the CVV (card verification value) check, to verify the credit card number. The IIN check checks the credit card number against the first six digits of the number, which represent the issuer of the credit card. The BIN check checks the credit card number against the first four or six digits of the number, which represent the bank that issued the credit card. The CVV check checks the credit card number against the last three or four digits of the number, which represent the security code of the credit card.

By using the credit card validator, you can verify the validity and the authenticity of a credit card, and you can avoid fraud and other issues that may arise from accepting an invalid or a fake credit card.

Here is a sample Python code for credit card validation using Python:

# Import the required libraries
import re
import requests

# Define the function to validate the credit card
def validate_credit_card(cc_number):
    # Check the length of the credit card number
    if len(cc_number) not in [13, 14, 15, 16]:
        return False
    
    # Check the format of the credit card number
    if not re.match(r'^\d{13,16}$', cc_number):
        return False
    
    # Check the Luhn algorithm of the credit card number
    cc_sum = 0
    for i, digit in enumerate(reversed(cc_number)):
        digit = int(digit)
        if i % 2 == 1:
            digit *= 2
            if digit > 9:
                digit -= 9
        cc_sum += digit
    if cc_sum % 10 != 0:
        return False
    
    # Check the issuer and the bank of the credit card number
    cc_iin = cc_number[:6]
    cc_bin = cc_number[:4]
    cc_url = f'https://lookup.binlist.net/{cc_bin}'
    cc_response = requests.get(cc_url)
    if cc_response.status_code != 200:
        return False
    cc_data = cc_response.json()
    if cc_data['scheme'] not in ['visa', 'mastercard', 'amex', 'discover']:
        return False
    if cc_data['bank']['name'] is None:
        return False
    
    # If all the checks pass, return True
    return True

# Test the credit card validator with some sample credit card numbers
test_cc_numbers = [
    '4111111111111111',  # Valid Visa card
    '5555555555554444',  # Valid Mastercard card
    '378282246310005',   # Valid Amex card
    '6011111111111117', # Valid Discover card
    '1234567890123456',  # Invalid length
    '4111111111111211',  # Invalid Luhn checksum
    '5105105105105100',  # Invalid issuer
    '371449635398431',   # Invalid bank
    '123456789012345',   # Invalid format
    'abcdefghijklmnop'   # Invalid format
]

for cc_number in test_cc_numbers:
    valid = validate_credit_card(cc_number)
    print(f'{cc_number}: {valid}')

This code defines a function validate_credit_card that accepts a credit card number as an argument, and it returns a Boolean value indicating whether the credit card number is valid or not. The function first checks the length and the format of the credit card number, and it then checks the Luhn algorithm of the credit card number. The function then checks the issuer and the bank of the credit card number using the BIN Lookup API, and it returns True if all the checks pass, or False if any of the checks fail.

The code then tests the validate_credit_card function with some sample credit card numbers, and it prints the result of the validation for each credit card number. You can modify and extend this code to suit your needs, and you can use it to validate the credit card numbers in your own applications.

Credit card validator in Python 💳

Jeff M.

CEO / Co-Founder

Enjoy the little things in life. For one day, you may look back and realize they were the big things. Many of life's failures are people who did not realize how close they were to success when they gave up.