I forgot my Known Traveler Number (KTN). How do I find it?

If you are a member of the TSA PreCheck® Application Program, look up your Known Traveler Number (KTN) here.  If you are a member of another trusted traveler program, such as Global Entry, NEXUS, or SENTRI, log on to the Trusted Traveler Program website to obtain your PASSID, which is your KTN.

Frequently Asked Questions Transportation Security Administration

Known Traveler Number on Global Entry Card (Unlimited Guides)

Known Traveler Number: Your Key to Speeding Through Security

TSA PreCheck Program

Known Traveler Number: What is it and should you get one? - The Points Guy

How to Find Your TSA PreCheck Number: Easy KTN Lookup

TSA PreCheck Program

air travel - If I apply for TSA Pre-Check now, can I use it on a flight that I've already booked? - Travel Stack Exchange

Ask TSA

TSA PreCheck Program

How to Add Your Known Traveler Number