TWIC / CAC Wiegand 58 bit format

Everything you need to understand TWIC / CAC Wiegand 58 bit format

Card format Overview

A proprietary 58-bit card format used in access control systems, featuring a unique structure composed of 14-bit agency code, 14-bit system code, 20-bit credential code, 4-bit credential series, and 4-bit individual series issue, and 2 parity bits (even and odd), allowing for easy management and avoiding card number duplication for secure, contactless access.

TWIC / CAC Wiegand 58 bit format format properties

Agency Code

14 bits (Bits 2-15), range 0-16,383.

System Code

14 bits (Bits 16-29), range 0-16,383.

Credential Code

20 bits (Bits 30-49), range 0-1,048,575.

Credential Series

4 bits (Bits 50-53), range 0-15.

Individual Series Issue

4 bits (Bits 54-57), range 0-15.

Even parity

Even Parity for Even parity over bits 1-28.

Odd parity

Odd Parity for Odd parity over bits 29-57.

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