1,2: Airline cards (e.g. Lufthansa)
7: Gas cards (Shell, Mobile)
8: Health-related and telecom cards (remember those old Sprint calling cards? That)
9: Reserved.
3,4,5, and 6 are the only types that would count as “credit cards”.
Riskable
Father, Hacker (Information Security Professional), Open Source Software Developer, Inventor, and 3D printing enthusiast
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Cake day: June 23rd, 2023
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34·2 months agoOooh! This is a great solution to this problem! Just write down both numbers and perform a luhn check:
https://en.wikipedia.org/wiki/Luhn_algorithm
The one that lies only has a 1 in 10 chance of making up a number that will pass the check! Cool shortcut: If it starts with a 1, 2, 7, 8, or 9, they’re lying. Those are reserved for things that aren’t credit cards 👍
The 2D vs 3D debate rages on…