What is an alien number or admission number?

An alien number is a unique 7, 8, or 9 digit number assigned to a noncitizen by the Department of Homeland Security upon the creation of a file.

An admission number is the number on a CBP Form I–94 or CBP Form I–94W, the arrival/departure form Customs and Border Protection (CBP) gives most nonimmigrant aliens when they arrive in the U.S. While most nonimmigrant aliens will automatically receive an admission number when they enter the U.S., Canadians will not. However, if a Canadian asks a CBP official for an admission number when he or she enters the United States, he or she will be given an admission number.

Last Reviewed September 15, 2015