The IPI number is an international identification number assigned by the CISAC database to songwriters and publishers to uniquely identify rights holders. It is used worldwide by more than 120 countries and more than 3 million right holders. CISAC is an international network of Performance Rights Organizations or PRO’s.
After you join your PRO as a writer, a CAE/IPI number will be generated for you in about a week. You can then find out what CAE/IPI number has been allocated to you by searching your PRO's repertoire for your registered songwriter/composer name. Your name will be followed by a number.