Distribution of a product or package is tracked through a supply chain having multiple entities that successively receive the product or package. A unique device identifier is associated with each of the supply chain entities and identifies a device that the supply chain entity uses to communicate with an administration computer. The supply chain entities electronically communicate to the administration computer via the device whenever the supply chain entities send a product or package to a successive supply chain entity in the supply chain or receive a product or package from a previous supply chain entity in the supply chain. The communication includes the unique device identifier of the supply chain entity, the unique product or package identifier of the product or package being sent or received, and the supplier code that the supply chain entity has received the product or package from, or sends the product or package to.