An I-94 is a form denoting the Arrival-Departure Record of foreigners used by U.S. Customs and Border Protection (CBP).
It must be completed at the time of entry to the United States by foreign citizens that are being admitted into the United States in a non-immigrant visa status.
The I-94 paper form is no longer required for international visitors arriving by sea or by air. Instead, arrival and departure information is gathered electronically from carriers. Visitors can verify immigration status or employment authorization, as well as record number and admission information at "https://i94.cbp.dhs.gov/I94/request.html".