2804 Wiegand

Everything you need to understand 2804 Wiegand

Card format Overview

A proprietary 28-bit card format used in access control systems, featuring a unique structure composed of 8-bit facility code and 15-bit card number, and 3 parity bits (even and odd), allowing for easy management and avoiding card number duplication for secure, contactless access.

2804 Wiegand format properties

Facility Code

8 bits. The facility code range is 0 to 255.

Card Number

15 bits. A unique serial number (0-32,767) for each card within that facility code.

Even parity

Even Parity for Even parity over bits 1-13.

Odd parity

Odd Parity for Odd parity over bits 5, 6, 8, 9, 11, 12, 14, 15, 17, 18, 20, 21, 23, 24, 26, 27.

Odd parity

Odd Parity for Odd parity over bits 0-26.

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Put in the values for this card format, we'll generate the results in a few different formats.

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The API that turns phones into key fobs.