What a KTN Number Is and Where to Find It

A KTN (Known Traveler Number) is a unique identifier that links your TSA PreCheck membership to your airline reservations. When you book a flight, you enter your KTN during checkout so TSA can see you are enrolled in PreCheck before you arrive at the airport. The TSA does not mail you a physical KTN card — the number itself is your credential.

You receive your KTN when ready after you complete your TSA PreCheck enrollment and pay the fee. If you enrolled in person at an enrollment center, you should have received it on a printed receipt. If you enrolled online, the number appears on your confirmation page and in your email receipt. Many people misplace these documents, which is why knowing how to retrieve it online is useful.

Key Takeaways

  • Your KTN is generated the moment you finish paying for TSA PreCheck enrollment and is sent to your email address on file.
  • You can retrieve your KTN by logging into your TSA PreCheck account at universalenroll.dhs.gov using the email and password you created during enrollment.
  • If you cannot remember your password, use the "Forgot Password" link on the login page to reset it with a code sent to your email.
  • Your KTN remains the same for the entire five-year validity period of your TSA PreCheck membership and does not change when you renew.

Log Into Your TSA PreCheck Account

The fastest way to retrieve your KTN is through the official TSA PreCheck enrollment system. Go to universalenroll.dhs.gov and click the "Sign In" button in the upper right corner. Enter the email address you used when you enrolled in TSA PreCheck and your password.

Once you are logged in, your dashboard will display your enrollment status and your KTN prominently near the top of the page. The number is typically 10 to 13 characters long and may include both letters and numbers. You can copy it directly from this page and paste it into your airline reservation or save it somewhere you can find it again.

If you enrolled through a third-party enrollment provider like Clear or a specific airline's enrollment program, you may still need to log into universalenroll.dhs.gov to see your official TSA PreCheck KTN. The third-party site may have shown you a temporary reference number, but your real KTN lives in the TSA system.

Reset Your Password If You Cannot Remember It

If you do not remember the password you created during enrollment, click the "Forgot Password" link on the universalenroll.dhs.gov login page. Enter your email address and select whether you want to reset via email or security questions.

If you choose email, TSA will send you a link that expires in 24 hours. Click that link and create a new password. If you choose security questions, you will answer the questions you set up during enrollment (such as your mother's maiden name or the city where you were born). Once you answer correctly, you can set a new password when ready.

After you reset your password, log back in to universalenroll.dhs.gov and your KTN will be visible on your account dashboard.

Check Your Email Receipts and Confirmation Documents

Your KTN was included in the confirmation email TSA sent you when you completed enrollment. Search your email inbox (including spam and promotions folders) for messages from "tsa@dhs.gov" or "Universal Enrollment" with a subject line mentioning TSA PreCheck confirmation or receipt.

The email will contain a confirmation number and your KTN listed separately. If you enrolled in person at an enrollment center, you should also have a printed receipt with your KTN on it. Check any documents you received that day or any papers you filed away after your appointment.

If you cannot find the original email, you can still retrieve your KTN through your online account. The email is a backup, not the only way to access it.

What to Do If Your Account Shows No KTN

If you log into universalenroll.dhs.gov and your account shows "Pending" or "Incomplete" status instead of an active KTN, your enrollment may not have been fully processed. This sometimes happens if payment did not go through or if your enrollment process was flagged for additional review.

Check your email for any messages from TSA asking for more information or documents. If you see a request, respond with what they are asking for. If you do not see any messages and your account has been pending for more than two weeks, contact the TSA PreCheck help desk at 1-855-347-8371 (Monday through Friday, 8 a.m. to 10 p.m. Eastern time) or visit tsa.gov/precheck/contact-us for other contact options.

Have your email address, date of birth, and the email address you used to enroll ready when you call. The help desk can tell you whether your payment was received and when you should expect your KTN to appear.

Using Your KTN When You Book a Flight

When you book a flight with any airline, look for a field labeled "Known Traveler Number," "KTN," or "TSA PreCheck Number" during checkout. This field is usually in the same section where you enter your name and date of birth. Paste or type your KTN exactly as it appears in your account — do not add spaces or dashes unless they are part of the actual number.

Entering your KTN at booking tells the airline to flag your reservation so TSA can see you are PreCheck-enrolled when you check in at the airport. If you forget to enter it at booking, you can usually add it later through your airline's website or mobile app by editing your reservation, or you can tell the gate agent when you check in (though this is less reliable).

Your KTN Does Not Change When You Renew

When your five-year TSA PreCheck membership is about to expire, you will receive an email reminder. When you renew through universalenroll.dhs.gov, your KTN stays the same — you do not get a new number. You only pay the renewal fee and update any information that has changed (such as your address or name). Your existing KTN continues to work throughout your new five-year period.

If you lose track of your KTN after renewal, log back into your account and it will still be there on your dashboard.

Frequently Asked Questions

What if I enrolled through an airline or Clear instead of directly with TSA?

You still have an official TSA PreCheck KTN in the universalenroll.dhs.gov system. Log in there to find your real KTN. The airline or Clear may have given you a reference number for their own system, but your actual TSA PreCheck number is what you need to enter when booking flights.

Can I use my TSA PreCheck ID number instead of my KTN?

No. Your TSA PreCheck ID number (printed on your physical ID card if you received one) is different from your KTN. When booking flights, always use your KTN, not your ID number. The KTN is what airlines and TSA use to link your reservation to your PreCheck status.

Is my KTN the same as my confirmation number?

No. Your confirmation number is a reference code for your enrollment transaction. Your KTN is your actual traveler credential. Both appear on your enrollment receipt, but only the KTN goes into airline reservations.

What if I never received a confirmation email after enrolling?

Log into universalenroll.dhs.gov with the email address you used to enroll. If your account shows active status with a KTN, your enrollment was successful even if the email went to spam or was lost. If your account shows pending status, contact the TSA PreCheck help desk at 1-855-347-8371 to check on your process.

Can I change my KTN to something easier to remember?

No. Your KTN is generated by the TSA system and cannot be customized or changed. It is assigned to your specific enrollment record and remains the same for your entire membership period.