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NIIN vs NSN: How the 13 Digits Break Apart

Posted by FedOpp on Oct 22nd 2026

Short answer: A National Stock Number is 13 digits. The first four are the Federal Supply Class. The last nine are the National Item Identification Number, the NIIN. The first two digits of the NIIN are the National Codification Bureau code. 00 and 01 mean the United States codified the item. DIBBS search uses the full NSN. The NIIN is the part of that number that identifies th …
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Short answer: Register the company in SAM.gov and wait for the CAGE code. Then open DIBBS, choose Vendor Registration, and finish the Super User account. DIBBS copies the legal name and address from SAM.gov. A postcard with a Physical Address Verification Number arrives in about 10 days, and registration stops until that number is entered. Get the CAGE code before you open DIBB …
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Short answer: A machine shop or parts manufacturer looks for DLA work on DIBBS, by National Stock Number and Federal Supply Class. SAM.gov is where you register the company and where you catch the buys that are not DLA spare parts. Quote the solicitations whose drawing, material, approved-source rule, and delivery you can meet. The award happens on DIBBS or SAM.gov, not in a re …
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