Magstripe with Facility Code
The bit processing is handled by the controller and output is returned as digits. There is a sequence of 5-bit blocks for each digit (1 bit parity, 4 bit binary-coded decimal BCD).
Most Magstripe cards that use a Facility Code store it on the first X digits.
Some older Magstripe cards using Facility Code store it after the Cardholder ID (and before the Issue code).
CCCCCFFFFII
F = Facility Code, range = 0 to 9,999
C = Cardholder ID, range = 0 to 99,999
I = Issue Code, range = 0 to 99
Card Layout
| Card Type: | Mag |
| Min number of digits: | 11 |
| Max number of digits: | 20 |
| Number of facility code digits: | 4 |
| Facility Code start: | 5 |
| Number of Cardholder ID digits: | 5 |
| Cardholder ID start: | 0 |
| Number of Issue Code digits: | 2 |
| Issue Code start: | 0 |
