To view this page, you should have the most recent Java installed
32-bit JRE (Java Runtime Environment) 1.8.0_05.
This Applet will run online in your browser, but it is a hybrid you
can also download, install and run it on your own machine as standalone
application. It will start and run faster if you do that. It will also
work safely even if you have disabled Java in your browser.
This Applet will help you tell if a credit card number is valid. It will also tell you which of the following
credit card companies issued the card: Amex, Diners Club, Carte Blanche, Discover, enRoute, JCB, MasterCard or
It validates the prefix and the checkdigit. It does not contact the credit card company to ensure that
number has actually been issued and that the account is in good standing.
The Applet is designed for cannibalising so that you can steal the code you need from it to include in your own
The Credit Card Validator amanuensis is also available with Java source to download. You can optionally run Credit Card Validation Amanuensis as an
application by invoking the com.mindprod.creditcard. ValidateCreditCard class.
On the Internet, approximately 70% of transactions are Visa, 27% are Mastercard and 3% are American Express.
If, CreditCard, the above Credit Card Validator signed Java Applet (that can also be run as an application) does not work…
Often problems can be fixed simply by clicking the reload button on your browser.
This signed Java Applet (that can also be run as an application) needs 32-bit or 64-bit Java 1.7 or later.
For best results use the latest 1.8.0_05.
In the Java Control Panel, configure medium security to allow vanilla unsigned applets to run.
It works under any operating system that supports Java e.g. W2K/XP/W2003/Vista/W2008/W7-32/W7-64/W8-32/W8-64/W2012/Linux/LinuxARM/LinuxX86/LinuxX64/Ubuntu/Solaris/SolarisSPARC/SolarisSPARC64/SolarisX86/SolarisX64/OSX
You should see the Applet hybrid above looking much like this screenshot. If you don’t, the following hints should help you get it working:
For this Applet hybrid to work, you must click grant/accept to give it permission to let you copy/paste.
If you refuse to grant permission, the program may crash with an inscrutable stack dump on the console complaining about AccessController.checkPermission.
If the above Applet hybrid appears to freeze-up, click Alt-Esc repeatedly to check for any buried permission dialog box.
If you have certificate troubles, check the installed certificates and remove or update any obsolete or suspected defective certificates. The only certificate used by this program is mindprodcert2014dsa.cer.
Especially if this Applet hybrid has worked before, try clearing the browser cache and rebooting.
To ensure your Java is up to date, check with Wassup. First, download it and run it as an application independent of your browser, then run it online as an Applet to add the complication of your browser.
If the above Applet hybrid does not work, check the Java console for error messages.
If the above Applet hybrid does not work, you might have better luck with the downloadable version available below.
If you are using Mac OS X and would like an improved Look and Feel, download the QuaQua look & feel from randelshofer.ch/quaqua. UnZip the contained quaqua.jar and install it in ~/Library/Java/Extensions or one of the other ext dirs.
If you are using Microsoft Internet Explorer 7, 8 or 9, try another browser. Seriously. Microsoft has taken great pains, over and over, to screw up Java and every other multi-platform standardisation.
If you are using Microsoft Internet Explorer 7, 8 or 9, you must click to allow blocked content permission for Active X to run. This also gives permission to Java to run. Click the Information bar, and then click Allow blocked content. Unfortunately, this also allows dangerous ActiveX code to run. However, you must do this in order to get access to perfectly-safe Java Applets running in a sandbox. This is part of Microsoft’s war on Java. Don’t put up with it! Use a different browser.
If you are using Microsoft Internet Explorer 9, makes sure the Java Plug-In SSV helper add-in is installed and enabled.
If it is not, try reinstalling the Java JRE.
If you have Windows 7 64-bit
and Internet Explorer 64-bit,
in theory you can use 64-bit Java,
but I never been able to get it to work.
Try upgrading to a more recent version of your browser, or try a different browser e.g. Firefox, SeaMonkey, Safari or Avant.
If you still can’t get the program working click HELP for more detail.
If you can’t get the above Applet hybrid working after trying the advice above and from the HELP button below, have bugs to report or ideas to improve the program or its documentation, please send me an email at.
Credit Card Validator is free. Full source included.
You may even include the source code, modified or unmodified
in free/commercial open source/proprietary programs that you write and distribute. Non-military use only.