HID generic 37bit

Everything you need to understand HID generic 37bit

Card format Overview

A proprietary 37-bit card format used in access control systems, featuring a unique structure composed of 32-bit card number, and 3 parity bits (even and odd), allowing for easy management and avoiding card number duplication for secure, contactless access.

HID generic 37bit format properties

Card Number

32 bits. A unique serial number (0-4,294,967,295) for each card within that facility code.

Even parity

Even Parity for Even parity over bits 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21.

Even parity

Even Parity for Even parity over bits 7, 8, 11, 12, 15, 16, 19, 20, 23, 24, 27, 28, 31, 32, 35, 36.

Odd parity

Odd Parity for Odd parity over bits 6, 7, 10, 11, 14, 15, 18, 19, 22, 23, 26, 27, 30, 31, 34, 35.

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Card Number

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