# RS2-HID F/C 3 33bit - (R901592C)

Everything you need to understand RS2-HID F/C 3 33bit - (R901592C)

## Card format Overview

A proprietary 33-bit card format used in access control systems, featuring a unique structure composed of 2-bit site code and 27-bit card number, and 2 parity bits (even and odd), allowing for easy management and avoiding card number duplication for secure, contactless access.

## RS2-HID F/C 3 33bit - (R901592C) format properties

### Site Code

2 bits. The facility code range is 0 to 3.

### Card Number

27 bits. A unique serial number (0-134,217,727) for each card within that facility code.

### Even parity

Even Parity for Even parity over bits 1-29.

### Odd parity

Odd Parity for Odd parity over bits 1-29.

### Generate examples

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

| Format | Value |
| --- | --- |
| Hex | E0000191<br>Copy |
| Decimal | 3758096785<br>Copy |
| Binary | 011100000000000000000000110010001<br>Copy |

## The API that turns phones into key fobs.