How do credit card companies not run out of numbers?
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The long and short is that there is no rule that credit cards have to be 16 digits long. If they actually do start “running out”, they can add more digits.
There are only two or three digits that are actually part of a plan for credit card numbers. The other 13 or 14 can be anything, and that gives 10,000,000,000,000 to 100,000,000,000,000 possible card numbers they can use. Even if they use a couple more digits for extra organizational purposes, they can still have 100 billion possible card numbers, which is more than they will need any time soon.
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