Format and Facility (Site) Code explained

• How can I find my format and facility code?

Definition of "Format"
A proximity card stores numbers. When a card is waved in front of a reader, those numbers are sent to the access controller. However, the controller needs to know how the received information is organized. This is know as the format.

For example, a string of numbers, 9495981699, may mean nothing to you. But, if you know it as a USA phone number, then it is immediately understood that the first 3 numbers constitute the area code, and the rest of the numbers, the phone number. This example, shows how knowledge of the format allows to properly decode the data.

The 26 bit Wiegand open format is the industry standard. Card manufacturers such as HID, Indala and AWID sell cards with this format to any dealer. This 26 bit format is recognized by all access hardware.
Over the years, formats with a higher number of bits (33, 37, 48, 50)  have been added to increase card security.

However, some of the higher bit formats are  "proprietary", and usually carry a higher price tag. One exception is the HID 37 bit propietary format, priced similarly to a 26 bit card.

Technical information links:

• HID Format Guidelines

• HID White Paper : Understanding Data Format

• The Standard 26 bit Format (H10301) bit layout
   

Definition of Facility code and serial number
Every card has a consecutive serial number programmed, assigned in your access control software to a card holder. For 26 bit cards, it can be from 0 to 65,535.
But, what happens if a company across the street also has an access system, and their card numbers are duplicated with yours? They could acccess your building and viceversa.
To reduce this risk, a second number, know as the facility or site code is encoded into each card. This number can go from 0 to 255 on a 26 bit format card.

Then, if your company has cards numbered from 1 to 1000, with facility code 230, they would be programmed as follows:
230 - 00001
230 - 00002
230 - 00003 .......up to 230 - 01000

The other company could have the same serial numbers, but with facility code 180, and their cards would be:
180 - 00001
180 - 00002
180 - 00003........up to 180 - 01000

To grant access, your system validates the facility code AND the serial number. It will rejecting the other company's cards, even if they have the same serial number, because the facility code does not match.

Lately, some formats have a greater number of bits, and make obsolete the notion of facility codes, because the card serial number (like the serial number on currency bills) is never duplicated at the factory.  This also means faster delivery of cards, even for add-ons to existing sites, right out of stock.

Cards ship with a facility code (if used) and serial number programmed.

How can I find my format and facility code?

If you are currently using cards, and just need to reorder, take one working sample and e-mail us the small numbers printed near the edge (see example at right for an HID ProxCard II card). We will use this info to check the HID database and locate the format and facility code for you.
Also, you can e-mail us the information printed on the label of one of the boxes where you received your last batch of cards (see example at right)

If your installation is new, we can help you to select the format and facility code for you.