An Export Control Classification Number (ECCN) is a five-character alphanumeric code used in the U.S. Commerce Control List (CCL), maintained by the Bureau of Industry and Security (BIS) within the Department of Commerce, to categorize dual-use items subject to the Export Administration Regulations (EAR). Each ECCN identifies the technical characteristics of a commodity, software, or technology and indicates the reasons for control — such as national security (NS), missile technology (MT), nuclear nonproliferation (NP), chemical and biological weapons (CB), regional stability (RS), or anti-terrorism (AT).
The format follows a consistent logic. The first digit (0–9) denotes one of ten broad categories, ranging from 0 (Nuclear Materials) to 9 (Aerospace and Propulsion). The second character is a letter (A–E) indicating the product group: A for end items, B for test equipment, C for materials, D for software, and E for technology. The final three digits specify the particular entry. For example, ECCN 3A001 covers certain electronic components, and 5A002 covers information security items using cryptography above defined thresholds.
ECCNs determine whether an exporter needs a license before shipping an item to a particular destination, end-user, or end-use. Exporters consult the Commerce Country Chart alongside the ECCN to see which controls apply to which countries. Items not listed on the CCL but still subject to the EAR are designated EAR99 and generally require no license except to embargoed destinations or restricted parties.
ECCNs are central to U.S. implementation of multilateral export-control regimes, including the Wassenaar Arrangement, the Missile Technology Control Regime (MTCR), the Australia Group, and the Nuclear Suppliers Group. Misclassification can lead to civil penalties under the Export Control Reform Act of 2018, criminal prosecution, and denial of export privileges. For political-economy analysts, ECCNs are a practical lens onto how states translate strategic-technology concerns — semiconductors, encryption, drones — into enforceable trade restrictions.
Example
In October 2022, the U.S. Bureau of Industry and Security tightened controls on advanced semiconductors and chipmaking equipment classified under ECCNs in Categories 3 and 4, restricting exports to China.