All HID cards have internal card numbering to reference the specific card holder with the access system database. Several types of card numbering options are offered for varying degrees of security and durability.
If card security is a concern, many organizations choose to either not place external numbering (option N) on the card, or utilize non-matching external numbering (option S or R) on the card
If you have any questions please call (800) 321-4405 x2