No credit card phone sex

Are you 100% sure on this or is there a chance, however slight, that the numbers above combined with a lucky guess at the expiry date would authorise?

Just wondering if you have picked numbers from a range than is not used by the cc companies and thus guaranteed to be invalid or if you’re just assuming that the chances of a random credit card number and a random expiry date matching up are as slim as to be virtually nil.

As you can see these would be very hard to calculate without the bank’s keys.

A very good article about the credit card number format can be found here: Anatomy of Credit Card Numbers As you can see below I get a lot of feedback about this page.

I’m doing something similar (generating a load of cc Luhn numbers) to test an ecommerce site and don’t want to accidentally have somebody billed.

[graham] The numbers are random, so technically there is a chance.

There you can see auth/post/settle transactions (as if they’d really happened) etc.

Test sites cost too, but they’re usually MUCH cheaper – since they don’t really have to bother banks and such – so you might get by with one or two cents a transaction – or a half-cent per – depending on the site. Depending on the site, it will either accept a limited range of valid card numbers, or (as the one I use does) any facially valid card is accepted. If you’re using a test site, it doesn’t give a damn.

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Credit card numbers that conform to the Luhn formula (MOD 10 check).

Usefull for testing e-commerce sites (because they should get past any pre-validation you do, and be declined at the card processor or bank stage).

In testing situations any expiry date within the next 3 years should work Feedback forces me to clarify this: These are NOT valid credit card numbers. They are random numbers that happen to conform to the MOD 10 algorithm.

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