Illinois AVN is an automated service that allows you to track an offender’s custody status, the status of a court case, or the status of a sex offender over the phone or Internet.  You can register to be notified by phone, email, and/or text message if an offender is released, transferred, escapes, or appears in court; or register to be notified by phone, email and/or text message about changes in the status of a registered sex offender.