U.S. Customs and Border Protection (“CBP”) announced that I-94 numbers will become alphanumeric effective May 2019 and that in replacement of the 11-digit numerical format, the new format will now have 9 digits with a letter in the 10th position and a digit in the 11th position.
CBP further provided that I-94 records that have not expired and were issued with the current numeric-only format will continue to be valid until the "Admit Until Date" reflected on the paper I-94 record (in passports) or on the electronic version found on CBP's I-94 website.
For more information on this CBP alert and additional I-94 matters, please visit https://www.cbp.gov/travel/international-visitors/i-94.