DSX D10202 33-Bit Format Guide: Compatible Cards & Fobs

DSX access control panels are installed in offices, schools, hospitals, and government buildings across the country, and many of those sites run the same card format: DSX D10202 33-bit. When it is time to add new employees or replace lost badges, the question is usually the same. What exactly do I order so the new credentials read on the existing readers and enroll cleanly in WinDSX?

This guide explains how the D10202 format is built, why the facility code matters so much on a DSX site, how to find the numbers you need, and how to reorder DSX compatible prox cards, key fobs, wristbands, and adhesive tags without duplicating credentials already in use.

Free samples are available so you can test compatibility before you buy. Request a free DSX D10202 sample card to test on your reader

 

What Is the DSX D10202 33-Bit Format?

D10202 is a 125 kHz proximity card format that uses a 33-bit Wiegand data string. It is the format most commonly shipped with DSX systems, which is why installers often call it simply "the DSX format" or "DSX 33-bit."

The format follows the same basic idea as the standard 26-bit H10301 format: a facility code identifies the site or customer, a card number identifies the individual credential, and parity bits help the panel catch read errors. The difference is in how the bits are allocated. D10202 trades some facility code space for a much larger card number range.

A few practical points to keep in mind:

• It is a prox format, not a smart card format. D10202 credentials are 125 kHz proximity, so they read on standard prox readers that output the full 33-bit string to the panel.
• The panel has to be set up for it. DSX panels can be configured for more than one format. A D10202 card will only grant access if the site is configured to accept 33-bit D10202 data and the facility code is active.
• It is a proprietary format. Original D10202 cards have historically been sold through DSX dealers, but compatible third-party credentials are widely used. AuthorizID offers a full line of credentials compatible with the DSX 33-bit D10202 format.

How the D10202 Bit Structure Works

Every D10202 credential carries 33 bits of data. As commonly documented by installers, the fields break down like this:

• Bit 1: Leading parity bit
• Bits 2–8: Facility code (7 bits, values 0–127)
• Bits 9–32: Card number (24 bits, values up to 16,777,215)
• Bit 33: Trailing parity bit

Compare that to 26-bit H10301, which uses an 8-bit facility code (0–255) and a 16-bit card number (0–65,535). The smaller facility code range on D10202 is rarely a problem for a single site, while the 24-bit card number field gives each facility code room for millions of unique cards. That is a big reason the format works well for large campuses and multi-building organizations.

You do not need to calculate parity yourself when ordering. Parity is generated automatically when the credentials are programmed. What matters is getting the facility code right and making sure the new card numbers do not overlap credentials already in your system.

 

Why the DSX Facility Code Matters

The DSX facility code is the number that ties your credentials to your system. If a new card carries the wrong facility code, the reader will still pick it up, but the panel will reject it because that code is not authorized at your location.

On most DSX sites, every credential in use shares one facility code, or a small handful of codes if the system has grown over time. When you reorder, the new cards should normally match the facility code already in use. Ordering a new facility code is possible, but it only works if someone adds that code to the system in WinDSX first.

Card numbers matter just as much. Within a facility code, every card number should be unique. If new cards overlap ones already issued, the system can see two credentials as the same card. Rather than selling fixed, pre-set number ranges, we work with you to find a card number range that does not overlap anything already enrolled in your system.

 

How to Find Your DSX Facility Code and Card Numbers

Before you order, confirm your facility code and, if you can, the card numbers already in use. There are a few ways to find this information, from quickest to most thorough.

 

Check the Box Label From a Previous Order

If you still have the box from an earlier batch of cards or fobs, the label is often the fastest answer. Proximity credential labels typically list the format (look for D10202 or "33-bit"), the facility code, and the starting and ending card numbers. A clear photo of that label is usually all we need to match your next order.

 

Look at an Existing Card or Fob

Most proximity credentials have a number printed or laser-engraved on them. Depending on the manufacturer, that number may be the card number alone or may include the facility code. A photo of the printed numbers on an existing card or fob helps us confirm what you have.

 

Look It Up in WinDSX

If you have access to the WinDSX software, you can confirm the details from the system itself:

• Open the cardholder record for an active user and note the card code assigned to them. The card number and its associated facility code are stored with each credential.
• Review the Location settings to see which facility codes and card formats the system is set up to accept. Menu names can differ between WinDSX versions, so your DSX dealer may need to help if you do not see these settings.
• Sort or search the card list to see which card numbers are already issued. Sharing that with us makes it easy to pick a range that will not overlap.

Mail In a Card for Inspection

If the photos are inconclusive or you simply are not sure, mail us one of your existing credentials. We can read it and confirm the format, facility code, and card number before you place a full order.

For a broader walkthrough that applies to any system, see our guide on how to identify your access card format, step by step.

 

DSX Compatible Credential Options

AuthorizID programs D10202 33-bit credentials in several form factors, so you can match what your site already uses or add a new style for specific users:

• Clamshell cards: Thick, durable white cards for employees who do not need a photo badge.
• Printable CR80 cards: Thin, ISO-size cards with a smooth surface for printing photo IDs on a badge printer. Choose these when your DSX access control cards double as employee ID badges.
• DSX key fobs: Keychain credentials available in black teardrop, black rectangle, and thick grey styles. A DSX key fob is popular for staff who would rather carry a credential on their keys than in a wallet.
• Wristbands: Black and blue fixed-size wristbands, plus black, red, and blue adjustable bands that fits nearly all wrist sizes. Useful for fitness centers, pools, and any setting where carrying a card is inconvenient.
• Adhesive tags: White and black thin proximity tags that stick to the back of a phone, an existing ID badge, or another flat surface. A handy way to give users one credential to carry instead of two.

Every style in the DSX D10202 compatible credential collection carries the same 33-bit data structure, so you can mix cards, fobs, wristbands, and tags on the same system as long as the facility code is correct and card numbers do not overlap.

 

How to Reorder DSX D10202 Credentials

Once you have your numbers, ordering is simple. Include the following with your order:

• Format: DSX D10202 33-bit
• Facility code: The code currently active on your system (0–127)
• Card numbers in use: Any information you have about the numbers already issued, such as a box label, a photo of an existing card, or a list from WinDSX
• Quantity: How many credentials you need
• Form factor: Clamshell, printable CR80, key fob, wristband, or adhesive tag

We will work with you to find a card number range that does not overlap credentials already in your system. If you are not sure about any of these details, send a photo of the box label or of an existing card, and we will help confirm them. Each product in the collection ships with a default facility code unless you specify one, so be sure to include your facility code with the order.

The minimum order is 2 pieces, which makes it easy to replace a single lost badge or add one new hire without buying a full box. Typical lead time is 4–5 business days, since every batch is programmed to your facility code.

 

Common DSX Ordering Mistakes to Avoid

Most DSX credential problems come down to a few avoidable errors:

• Ordering 26-bit cards for a 33-bit site. A standard 26-bit H10301 card will not enroll on a system expecting D10202 data, even if the facility code number looks right.
• Guessing the facility code. A card with the wrong facility code reads on the reader but is denied by the panel. Confirm the code from a label, an existing card, or WinDSX before ordering.
• Duplicating card numbers. Ordering credentials without checking what is already enrolled risks overlapping cards already issued. Share what you know about your existing numbers so we can help you avoid overlaps.
• Assuming every DSX site uses D10202. It is the most common DSX format, but some older or expanded sites run other formats. Confirm the format of any credentials that behave differently.

Quick DSX Reorder Checklist

Before you place an order for DSX 33-bit credentials, confirm the following:

• The site is configured for the D10202 33-bit format
• You know the facility code currently active in WinDSX
• You have gathered what you know about card numbers already issued, so we can help you choose a range that does not overlap
• You have chosen the form factor for each user group: clamshell, printable CR80, key fob, wristband, or adhesive tag
• You have tested a sample if the format or facility code is in any doubt

With those items settled, your new credentials should enroll on the first try.

 

Test DSX D10202 Compatibility Before You Order

The surest way to confirm a credential works with your system is to test one on your own reader. A sample lets you verify that your DSX panel accepts the 33-bit data and that the facility code enrolls correctly in WinDSX before you commit to a full batch.

Get in touch to claim a free DSX 33-bit sample credential