The Standard 26 Bit Format
(c) HID Corporation - Technical Support Department
Tech Tip # 5
The Standard 26-bit Format is an open format. It is a widely used industry standard, and is
available from many sources. Almost all
access control systems accept the Standard 26-bit Format.
There are 256 possible facility codes. There can be up to 65,535 card ID numbers per
facility code. The total number of cards
that can use the entire range without duplication is 16,711,425. There are no restrictions on the use of this
format. It is not tracked by HID, and
there are duplicate cards in use.
The standard 26 bit Wiegand format is H10301. It is binary encoded data. The format consists of 2 parity bits, 8 bit
facility code and 16 bit card number fields.
The format is shown below.
PAAAAAAAABBBBBBBBBBBBBBBBP
EXXXXXXXXXXXX
XXXXXXXXXXXXO
where:
P = Parity O
= Odd Parity
A = Facility code, range = 0 to
255 E
= Even Parity
B = Card Number, range = 0 to
65,535 X =
Parity mask
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