
A QR Code is build up with black and white elements that can be translated to a binary number notation. The number of facets or possibilities that can build up a valid QR Code are therefore a power of two.
The current displayed code, a version 3, medium error correction, can hold 44 bytes. that is 44 * 8 equals 352 bits.
2 to the power of 352 (2 **352) thus
91739944639602860464432835812083477631862599566731244949503553575476915043539392
32280074212440502746218496
valid possibilities, for only one version of qr code.
This number will be slightly limited when the content also needs to have some relevant information or when a graphic is inserted, but we will not run out of valid (custom) qr codes any time soon.
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