Track your FedEx shipments by your reference, purchase order, or invoice numbers. Choose your Reference Type, enter the corresponding Account Number, and up to 25 reference numbers of your selected reference type (one entry per line), and click on Track It. Reference Type FedEx Express Reference Number FedEx Express Tracking Number FedEx Ground Reference Number FedEx Ground Purchase Order Number FedEx Ground Invoice Number FedEx Ground Package Number Account Number (FedEx Express or FedEx Ground) Reference Numbers (one per line)