Originally Posted by
Concerto
What is a Known Traveller number, or redress # ? Sounds ominous, but I've never been clear as to what this is exactly.
https://ttp.dhs.gov/
The KTN is the ID the DHS uses to manage membership in Trusted Traveler Programs such as Global Entry. IIRC it is also used if you are a member of TSApre (only).
Re:Redress Number
https://www.dhs.gov/redress-control-numbers