Global Entry and TSA PreCheck are some of the trusted traveler programs that a frequent flier might be familiar with. People who use these programs might also be versed with the known traveler number (KTN), which is issued by the Department of Homeland Security. While filling out some forms, travelers might be asked to provide their KTN or a redress number. But not everyone is familiar with a redress number. In this article, we are going to dive into what this number is.