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Converting proximity cards numbers

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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)

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I find an easy way to find what numbers a given reader/system uses, is just to swipe the new cards/fobs, and look for them in the error logs (they should show up as being unknown or unauthorized). From there, you'll have the appropriate numbers to enter!

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Yea I know about that but this is old controller and do not save illegal cards. There is no way to see what it sees. I found two neighboring cards (1 number difference) and the same difference is in the second number group (incremented by 1 on both sides). But this not apply on all cards. I think the third short number that is also present/written on some cards should be included in the math.

 

 

Ideas??

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People there is no way to find a reader like that (it is from a competing company) and we are now taking over the maintenance and we need to sell additional cards. Is there a way to calculate the numbers? Are there any relations between the two numbers on the cards?

 

Our readers see the number that is printed on the keytags but this controller is registering the missing unprinted number (there is no space for both numbers on the tags like there is on normal cards)

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