What is an NSN?

• A. A 13-digit number assigned by the Defense Logistics Information Service
• B. A 9-digit item code assigned by the Army
• C. A stock number for Navy stores
• D. A national standard number for suppliers

Answer: (A)

An NSN is a National Stock Number, a unique 13-digit code used to identify an item across the U.S. DoD and NATO supply systems. It is assigned by the Defense Logistics Information Service, ensuring all services and allied partners refer to the same item in the same way. The code is structured as a four-digit Federal Supply Classification plus a nine-digit National Item Identification Number, which together standardize how items are cataloged, ordered, and stocked. This makes it different from Army-specific codes, Navy-specific stock numbers, or any generic “national standard” number outside the DoD/NATO catalog system.