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You may contact CBP only if you recently traveled outside the U.S. and were admitted at a port of entry under a class of admission other than F-1.
To verify your admission status, check your electronic I-94 online at least 24 hours after your arrival. If your status is incorrect, you must contact the appropriate CBP office based on the airport where you last entered the U.S. to request a correction to F-1 status.