Based on your input “[94,”, it seems you might be looking for information regarding Form I-94, which is the Arrival/Departure Record for foreign visitors entering the United States.
Purpose: The I-94 is issued by U.S. Customs and Border Protection (CBP) to document legal entry and determine how long a foreign national can stay in the U.S..
Format: Since 2013, most I-94 records are electronic. As of May 2019, they are 11 characters long, containing 9 digits followed by a letter and a digit (alphanumeric).
Accessing/Printing: You can access your electronic record and print it for official purposes (such as applying for a Social Security number or driver’s license) on the official CBP I-94 website.
Validity: The record shows your class of admission (e.g., F-1, H-1B) and your “admit until” date.