Is the Audit Number the Same as the DD Number? ID Documents Explained

Yes. On most modern U.S. IDs, the audit number and the DD number refer to the same thing: a unique “document discriminator” that identifies that exact physical card. On Texas licenses, it’s a 20‑digit code printed along the bottom and it changes every time you renew, replace, or update the license, even though your main license number stays the same. If you’re wondering how this number’s used to verify you online, that’s next.

Key Takeaways

• On Texas driver’s licenses, the audit number and DD number are the same 20‑digit “Document Discriminator” printed along the bottom of the card.
• This number is a unique identifier tied to that specific physical license card, separate from your permanent driver’s license number.
• Every time Texas reissues your license (renewal, replacement, address change), a new audit/DD number is generated and the old one becomes invalid.
• The audit/DD number is required to verify your license for many Texas online services, such as requesting your driving record.
• Other states also use DD numbers, but formats, locations, and whether they change with reissues can differ from Texas’s system.

Are the Audit Number and DD Number the Same?

On Texas and many other state driver’s licenses, the “audit number” and “DD number” actually refer to the same 20‑digit identifier printed on the card.

“DD” stands for “Document Discriminator,” but in practice, you can treat both terms as describing one unique code tied to that specific physical license.

Texas’s Department of Public Safety even uses the terms interchangeably in its own materials. You rely on this DD/audit number as the license’s only guaranteed unique identifier. It’s what truly separates one plastic card from another, even when they belong to the same person. This 20‑digit number also must be the most recent one issued, because older audit numbers are automatically invalidated when your license is updated.

When the state reissues your license—after an address change, renewal, or replacement of a lost or stolen card—it generates a brand‑new DD/audit number. The old one becomes canceled and invalid.

That process lets the state authenticate the card you’re holding, block fraudulent reuses of past numbers, and guarantee only one current license exists for you.

Where to Find the Audit/DD Number on Your License

Wondering where that audit or DD number actually sits on your license? On a Texas driver’s license, look along the bottom edge of the plastic card. You’ll see a long 20-digit string clearly labeled as the “audit number” or “DD” (for document discriminator).

On Texas licenses, your audit or DD number is the 20‑digit code printed along the bottom edge

That’s the code Texas uses to distinguish one printed card from another, and it’s only on the hard plastic license you receive in the mail—not on the temporary paper license.

If you hold a Louisiana license, you’ll find a much shorter code. Look near your descriptive details, such as eye color and height. There, you’ll see a four-digit number printed alongside those physical characteristics; that’s your audit number. If you can’t locate or read your Louisiana audit number, you’ll need to contact the OMV at (225) 925-6146 for assistance in retrieving it.

When Texas asks for your audit/DD number online—for example, to order or instantly print your driving record—use that exact code from your current plastic license.

Why Your Audit/DD Number Changes With New Licenses

Now that you know where to spot the audit or DD number on your license, it helps to understand why it changes every time you get a new card. Unlike your permanent eight-digit driver’s license number, the 20-digit audit/DD number identifies that specific physical card. Texas generates it using issuance details like date, location, and internal state factors, so each card you receive must have a different number. These numbers also tie into the license’s security features and anti‑forgery design, helping states detect tampering or counterfeit cards.

Any time the state prints a new license—because you’ve renewed, changed your address, or replaced a lost or stolen card—it assigns a new audit number and cancels the old one. The same thing happens if the state reissues cards for security or administrative reasons.

This constant change guarantees there’s only one valid card tied to you at any moment and lets the system clearly distinguish between original and replacement licenses. Temporary paper licenses don’t show an audit/DD number at all.

How Your Audit/DD Number Verifies You and Your Record

Although it looks like just another long string of numbers, your audit or DD number quietly does the heavy lifting when it comes to proving both you and your license are legitimate. In Texas, the 20-digit audit number uniquely tags the exact card in your hand. When DPS systems see that number, they know they’re dealing with the newest, valid license and not an old, replaced, or stolen one.

Each time the state prints a new card, it generates a fresh audit or DD number based on issuance details, then cancels the old one. That’s why only the most recent number works for online services.

When you order a Texas driving record online, the system won’t proceed without that audit number, plus your license number, date of birth, and last four of your SSN. Together, they verify your identity, confirm your record, and block anyone using a discarded card.

How Texas and Other States Use Audit/DD Numbers Differently

Texas leans heavily on the audit/DD number, not just to authenticate your license, but to run key online services like replacements and driving record requests. You can’t complete an online replacement or instant Driver Record Request without entering this 20‑digit identifier along with your 8‑digit license number. This 20-digit DD number is a unique identifier that allows DPS to distinguish every license it issues, even when the driver’s main license number stays the same.

Each time Texas reissues your license—after an address change, loss, or theft—it assigns a new audit/DD number, while your DL number stays the same.

Other states also use DD numbers, but they often treat them more as quiet security features than everyday tools you interact with.

• Texas ties the audit/DD number to specific online services you regularly use.
• Many states mainly use DD numbers for back-end authenticity checks.
• Texas regenerates the DD on every reissue; some states keep theirs more static.
• Texas even lets you use an ID card’s audit number for certain applications if you don’t have a license.

Frequently Asked Questions

Can Someone Steal My Identity if They Know My Audit/Dd Number?

No, someone can’t realistically steal your identity with just your audit/DD number. They’d still need key details like your license number and personal data. Still, protect it, and promptly report a lost or stolen license.

Do Paper or Temporary Licenses Always Include an Audit/Dd Number?

No, paper or temporary licenses don’t always include an audit/DD number. In Texas, they never do. You’ll need to wait for the plastic card for that number, or use mail-in options for records instead.

Is the Audit/Dd Number Used by Police During Traffic Stops?

Yes, police use it mostly behind the scenes. During stops, they rely on your main license number, then barcode or strip scans pull the DD/audit number to verify authenticity, detect fraud, and confirm your newest license’s validity.

Does My Passport or State ID Also Have a Dd-Style Number?

Your passport doesn’t use a DD-style number; it relies on the passport number and machine-readable zone instead. Your state ID might have a DD/audit number, depending on your state, similar to what’s on your driver’s license.

How Long Does an Old Audit/Dd Number Remain Visible in State Records?

It stops being usable for verification immediately, but it doesn’t vanish from state archives. You can’t see or use it online, yet mailed driving record requests still reflect your full history, regardless of old DD numbers.

Conclusion

By now, you know your audit or DD number isn’t just random text on your license. It’s a unique identifier that helps verify your identity, track your record, and distinguish old documents from new ones. When you renew your license, expect that number to change, and don’t confuse it with your license number. If you’re ever unsure where to find it or how it’s used in your state, check your card carefully or ask your DMV.