# 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.

### Generate examples

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

### Card Number

Get examples

#### Here's your example

| Format | Value |
| --- | --- |
| Hex | 2000000C8<br>Copy |
| Decimal | 8589934792<br>Copy |
| Binary | 0001000000000000000000000000011001000<br>Copy |