The OEN is a student identification number assigned by the Ministry of Education to Ontario elementary and secondary students. This unique number is used as the key identifier on a student's school records, and follows the student through their elementary and secondary education. The OEN is nine digits long (eight digits, plus a check digit), randomly assigned, and tied to stable information about the student (name, gender, date of birth).
For more information, click https://www.ontario.ca/page/collection-and-use-education-information or call the Ministry of Education at 416-325-2929 or 1-800-387-5514.