# HID 37 Bit (H10302)

Everything you need to understand HID 37 Bit (H10302)

## Card format Overview

A proprietary 37-bit card format used in access control systems, featuring a unique structure composed of 35-bit card number, and 2 parity bits (even and odd), allowing for easy management and avoiding card number duplication for secure, contactless access.

## HID 37 Bit (H10302) format properties

### Card Number

35 bits. A unique serial number (0-34,359,738,367) for each card within that facility code.

### Even parity

Even Parity for Even parity over bits 1-18.

### Odd parity

Odd Parity for Odd parity over bits 19-36.

### 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 | C8<br>Copy |
| Decimal | 200<br>Copy |
| Binary | 0000000000000000000000000000011001000<br>Copy |

## The API that turns phones into key fobs.