What Is Electronic Product Code?

Electronic Product Code (EPC) is a standardized identification scheme that assigns a globally unique numeric identifier to individual physical objects, unit loads, locations, and other entities involved in commercial or logistical operations. Defined and maintained by GS1, the international supply chain standards body, EPC extends the barcode-based Global Trade Item Number (GTIN) by adding serial-number information so that each individual item, rather than each product class, carries a distinct identifier. In its primary application, EPC is encoded onto passive RAIN RFID (Radio Frequency Identification) tags, allowing automated readers to capture identity data without requiring line-of-sight scanning.

EPC emerged from research at the Auto-ID Center, founded at MIT in 1999 with support from a consortium of consumer goods manufacturers. The goal was to replace barcode scanning, which requires sequential, one-at-a-time reads, with bulk RFID reads that could capture hundreds of tagged items simultaneously as they passed through a dock door or conveyor. The EPCglobal initiative, now operated under GS1, formalized the standards that underpin the system, including the EPC Tag Data Standard (TDS), which defines the binary encoding of EPCs on RFID tags and their mapping to GS1 identification keys.

EPC Information Services

Electronic Product Code Information Services (EPCIS) is the GS1 standard that records and shares visibility events associated with EPC-identified objects. Each EPCIS event captures the "what, when, where, and why" of an object's movement or status change: what object was involved (identified by its EPC), when the event occurred, where it took place (expressed as a GS1 Location Code or latitude-longitude coordinate), and why it occurred (the business context, such as shipment, receipt, or retail sale). These events are stored in EPCIS repositories and shared among supply chain partners through query interfaces, enabling end-to-end traceability from manufacturing to point of sale.

The EPCIS standard, published by GS1, is used in industries including retail, pharmaceuticals, food, and aerospace to track the provenance and custody chain of goods. The U.S. Drug Supply Chain Security Act (DSCSA) mandates EPCIS-based serialization and traceability for prescription drug packages, using EPC serial numbers to verify product identity at each distribution step.

The EPC Global Network

The EPC Global Network is the information infrastructure connecting the RFID tag data capture layer with the back-end systems that store and query EPCIS event data. It consists of RFID readers that capture tag reads, middleware that filters and aggregates raw read data, EPCIS repositories that store event records, and discovery services that help trading partners locate EPCIS repositories holding data for a given EPC without exposing the contents of those records.

Discovery services are particularly important in multi-tier supply chains, where a retailer querying the history of a product may not know in advance which manufacturer, distributor, or logistics provider holds EPCIS records for that item. A discovery service accepts an EPC query, returns pointers to the repositories authorized to provide event data for that EPC, and leaves the actual data exchange to the querying party and the repository, preserving data confidentiality while enabling cross-enterprise traceability. Implementation guidance for the network is published in GS1's EPCglobal reference materials.

Applications

Electronic Product Code has applications in a wide range of supply chain, logistics, and regulatory contexts, including:

• Retail inventory management using bulk RFID reads to track store-level stock levels in real time
• Pharmaceutical serialization and pedigree tracking under U.S. and EU drug traceability regulations
• Food safety and recall management, enabling rapid identification of affected lots from farm to retailer
• Aerospace parts authentication and maintenance history tracking for airworthiness compliance
• Logistics and freight tracking across multi-modal transportation networks