I have problem with some keytags
On normal plastic cards there are two set/groups of numbers
One that is 10 digits (0-9) and a set of 8 digits (0-9) next to them. The 8 digits group is separated with "," 3+5 digits.
Take a lpok at
http://76.my/Malaysia/blank-thick-proximity-card-125khz-1006-02-SZXENON@1.jpg
Some controllers see the first 10 digits and the other see the other 8 digits group. Now I have keytags that only have the second 8 digits group printed and I need to enter them in the system that reads the first 10 digits. Is there a math that can be done as I can not see the numbers with a reader (the system does not remember illegal cards)