An NSN (National Stock Number) is a 13-digit code for an item the government buys: 4-digit Federal Supply Class (FSC) plus 9-digit NIIN.
How is an NSN structured?
Take NSN 5305-01-234-5678 as a format example.
Where can I look up an NSN for free?
- PUB LOG: a catalog dataset DLA publishes for download, with NSNs, part numbers, CAGE codes and item names.
- WebFLIS: DLA's official online Federal Logistics Information System query.
- DIBBS: search open RFQs and awards by NSN or NIIN to see current demand.
How do I look up an NSN by part number?
Search the manufacturer's part number together with its CAGE code.
What should I check after I find the NSN?
- Is there an open RFQ on DIBBS, and when is it due?
- Which CAGE codes and part numbers are listed as approved sources?
- What did past awards pay, and for what quantity?
- What packaging and first-article requirements apply?
Work through the full NSN research checklist before you quote.
How do I use FSC codes to find more NSNs?
The first four digits of an NSN are its FSC.
How does FedOpp help with NSN lookup?
FedOpp is government-opportunity research software that watches SAM.gov and DLA DIBBS and searches NSN, NIIN, FSC and CAGE data for small businesses; you bid on the official portals, and FedOpp costs.
Frequently asked questions
What is an NSN number?
A National Stock Number is a 13-digit code for an item of supply: the first four digits are the Federal Supply Class (FSC) and the last nine are the National Item Identification Number (NIIN).
How do I look up an NSN by part number?
Search the manufacturer's part number together with its CAGE code in an official catalog source or in FedOpp; the result shows the NSN assigned to that part.
Is there a free NSN lookup?
Yes. DLA publishes PUB LOG, a free downloadable catalog dataset.
What is the difference between an NSN and a NIIN?
An NSN is 13 digits. The last nine are the NIIN.
Does FedOpp submit bids?
No. FedOpp does not submit bids or quotes; you submit on SAM.gov and DIBBS yourself.
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