# HID Simplex 36bit

Everything you need to understand HID Simplex 36bit

## Card format Overview

A proprietary 36-bit card format used in access control systems,
featuring a unique structure composed of 8-bit site code and 24-bit card number, and 2 parity bits (odd),
allowing for easy management and avoiding card number duplication for secure, contactless access.

## HID Simplex 36bit format properties

### Site Code

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

### Card Number

24 bits. A unique serial number (0-16,777,215) for each card within that facility code.

### Odd parity

Odd Parity for Odd parity over bits 1-17.

### Odd parity

Odd Parity for Odd parity over bits 17-35.

### Generate examples

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

### Site Code

### Card Number

Get examples

#### Here's your example

| Format  | Value                             |
| ------- | --------------------------------- |
| Hex     | 3200000C8<br>Copy                 |
| Decimal | 13421773000<br>Copy               |
| Binary  | 001100100000000000000000000011001000<br>Copy |

## The API that turns phones into key fobs.