# HID 33bit - (D10202)

Everything you need to understand HID 33bit - (D10202)

## Card format Overview

A proprietary 33-bit card format used in access control systems, featuring a unique structure composed of 7-bit site code and 24-bit card number, and 2 parity bits (even and odd), allowing for easy management and avoiding card number duplication for secure, contactless access.

## HID 33bit - (D10202) format properties

### Site Code

7 bits. The facility code range is 0 to 127.

### Card Number

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

### Even parity

Even Parity for Even parity over bits 1-16.

### Odd parity

Odd Parity for Odd parity over bits 17-32.

### 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 | 1C80000C8<br>Copy |
| Decimal | 7650410696<br>Copy |
| Binary | 111001000000000000000000011001000<br>Copy |

## The API that turns phones into key fobs.