# Lenel

Everything you need to understand Lenel

## Card format Overview

A proprietary 42-bit card format used in access control systems, featuring a unique structure composed of 14-bit site code and 12-bit card number, and 2 parity bits (even and odd), allowing for easy management and avoiding card number duplication for secure, contactless access.

## Lenel format properties

### Site Code

14 bits. The facility code range is 0 to 16,383.

### Card Number

12 bits. A unique serial number (0-4,095) for each card within that facility code.

### Even parity

Even Parity for Even parity over bits 1-20.

### Odd parity

Odd Parity for Odd parity over bits 21-40.

### Generate examples

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

### Here's your example

| Format   | Value                                                                      |
|----------|----------------------------------------------------------------------------|
| Hex      | 20640640000<br>Copy                                                        |
| Decimal  | 2225873354752<br>Copy                                                       |
| Binary   | 100000011001000000011001000000000000000000<br>Copy                       |

## The API that turns phones into key fobs.