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When did credit cards go from 13 digits to 16 digits?

Asked by elbanditoroso (13669 points ) December 16th, 2013

I remember back in the 70s-80s, Master Charge and Visa credit card numbers were shorter – 13 digits instead of 16 digits as they are today. I think the used to be in a 4–3-3–3 pattern.

Somewhere along the way they were all converted to what we have today. Do you know when?

Do you think we’ll ever go from 16 to 18 or even 20? Will they ever run out of numbers?

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