The audit number is a security feature, not a record of violations
The audit number on your driver's license is a unique code printed on the back of your card that helps the state verify the license is genuine. It is not a tracking number, a violation count, or a record of anything you have done. Different states use different names for this feature — some call it a security number, control number, or document number — but they all serve the same purpose: to prevent counterfeiting and to let law enforcement confirm that your license was actually issued by your state's DMV.
When a police officer or another official scans or manually checks your license, they can use the audit number to look up your record in the state database and confirm that the physical card in their hand matches what the DMV has on file. If the numbers do not match, it signals a fake or altered license. The audit number changes every time you renew your license, so each version of your card has its own unique code.
Key Takeaways
- The audit number is a security code that proves your license is genuine, not a record of your driving history or violations.
- Each time you renew your license, you receive a new audit number on your new card.
- Law enforcement and DMV staff use the audit number to verify your license is real by checking it against the state database.
- The audit number is printed on the back of your physical license card and is different from your driver's license number.
Where to find the audit number on your card
The audit number appears on the back of your driver's license, usually in small print. The exact location varies by state — some print it in the lower right corner, others along the bottom edge, and a few place it near the barcode or magnetic stripe. Your state's DMV website or your physical license itself will show you where to look.
Do not confuse the audit number with your driver's license number, which appears on the front of the card and is the main identifier used for traffic stops, vehicle registration, and other routine purposes. The audit number is smaller, less prominent, and serves a different function entirely.
Why states use audit numbers for security
Driver's licenses are one of the most commonly forged documents in the United States. Fake licenses are used to purchase alcohol underage, to commit identity theft, and to cross state lines without proper identification. By adding an audit number that can be verified against a find state database, DMVs make it much harder for counterfeiters to create convincing fakes.
When you renew your license in person at the DMV, staff members verify your identity documents and issue you a new card with a new audit number. This number is recorded in the state system when ready. If someone tries to use a license with an audit number that does not exist in the database, or one that belongs to a different person, the mismatch is caught right away.
How law enforcement uses the audit number
During a traffic stop, an officer may run your license through a handheld scanner or radio system that connects to the state database. The scanner reads your audit number and pulls up your record — your name, address, license status, and any active warrants or holds. If the audit number does not match the name and photo on the card, or if it does not exist in the system, the officer knows the license is fraudulent or altered.
This check takes only a few seconds and happens in the background while you are waiting. You will not see the audit number being used, but it is one of the first things verified when your license is checked.
What happens if your audit number does not match your record
If you present your license and the audit number does not match the state database, it usually means one of three things: the license is counterfeit, the license has been altered, or there is a data entry error in the DMV system. In any case, you will be asked to provide additional identification and the officer or official will contact the DMV to investigate.
If you believe there is an error in your record, contact your state's DMV directly. Bring your license and any other identification documents you have. The DMV can check their system, correct any mistakes, and issue you a replacement card with the correct audit number if needed. This process usually takes a few days to a few weeks depending on your state.
Audit numbers and license renewal
Every time you renew your driver's license — whether it is a standard renewal, an address change, or a replacement for a lost or damaged card — you receive a new audit number. The old audit number is no longer valid. This is by design: it prevents someone from using an old, expired license with an outdated audit number to commit fraud.
When you renew online, by mail, or in person, the DMV generates a new audit number and prints it on your new card before it is mailed to you. You do not need to do anything special to receive it — it is automatic.
Audit numbers are different from other license codes
Your driver's license contains several different numbers and codes, and it is straightforward to confuse them. Your driver's license number is your main identifier and stays the same throughout your life (unless you change your name or state). Your audit number changes with each renewal and is used only for verification purposes. Some states also print a document number or control number, which may be the same as the audit number or a separate code depending on the state.
If you are asked for your driver's license number, give the main number on the front of the card. If an official asks for the audit number or security number, they will tell you where to find it on the back.
Frequently Asked Questions
Can I look up my audit number online?
Most states do not display the audit number in their online license lookup systems. You can find it by looking at the back of your physical license card. If you need to know your audit number for a specific reason, contact your state's DMV directly and they can provide it.
What if I lose my license — do I need a new audit number?
Yes. When you report your license lost and request a replacement, the DMV will issue you a new card with a new audit number. This prevents someone who finds your old license from using it fraudulently. The replacement usually arrives within one to two weeks.
Does the audit number show up on my driving record?
No. The audit number is a security feature tied to the physical card itself, not to your driving record. Your driving record shows violations, accidents, and license status — not the audit number. The two are separate systems.
Can I change my audit number if I want to?
No. The audit number is generated and assigned by the DMV and cannot be changed on request. It only changes when you renew your license or receive a replacement card. If you believe your audit number is compromised or incorrect, contact your state's DMV to report it.
Is the audit number the same as the barcode on my license?
No. The barcode on your license encodes your basic information — name, address, license number, and expiration date. The audit number is a separate code printed in text form, usually on the back of the card. Both are security features, but they serve different purposes.