CFLib.org – Common Function Library Project

Description:
Returns the card type of a card number. Will return "Unknown" if the card type cannot be detected.

Return Values:
Returns a string.

Example:

<cfoutput>
What card type is 4111111111111111? #GetCardType(4111111111111111)#
</cfoutput>

Parameters:

Full UDF Source:

/**
 * Returns the card type of a card number.
 * 
 * @param cardNumber      The credit card number. (Required)
 * @return Returns a string. 
 * @author Dave Cordes (dcordes@apoktechnology.com) 
 * @version 1, November 3, 2005 
 */
function getCardType(cardNumber) {
    var CardType = "Unknown";
    var CardLength = Len(cardNumber);
    
    if ((CardLength eq 15) and (((Left(cardNumber, 2) is "34")) or ((Left(cardNumber, 2) is "37")))) CardType = "American Express";
    if ((CardLength eq 14) and (((Left(cardNumber, 3) gte 300) and (Left(cardNumber, 3) lte 305)) or (Left(cardNumber, 2) is "36") or (Left(cardNumber, 2) is "38"))) CardType =  "Diner's Club";
    if ((CardLength eq 16) and (Left(cardNumber, 4) is "6011")) CardType =  "Discover Card";
    if ((CardLength eq 16) and (Left(cardNumber, 2) gte 51) and (Left(cardNumber, 2) lte 55)) CardType =  "MasterCard";
    if (((CardLength eq 13) or (CardLength eq 16)) and (Left(cardNumber, 1) is "4")) CardType =  "Visa";
    
    return CardType;
}