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.

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