I hope you are trolling. You understand that every possible prefix / range has a billion numbers minimum? That japans population is only 125 million? And actu

I hope you are trolling. You understand that every possible prefix / range has a billion numbers minimum? That japans population is only 125 million? And actually - you can near randomly assign numbers if you wanted, looking up card issuer is not difficult. Can basically issue card numbers in blocks of 100 if you wanted to reduce lookup tables a bit. This is already happening and available actually. Visa and other (apple) offer tokenization services to randomize your card number. Every phone number uses this type of system to enable number portability as well (you can take your phone number from t-mobile to sprint). With 16 digits (1,234,567,890,123,456) you have 999 trillion numbers you can assign. As my original comment pointed out, the idea that we are running out of credit card numbers is absolutely ridiculous.