NSN Lookup: Check Approved Sources, Prices, and Vendors for Any Part
An NSN lookup should tell you more than what a part is. Learn to check approved sources, AMSC status, award prices, and vendors before you quote DLA.
On November 9, 2026, open solicitations on DIBBS named 18,184 different National Stock Numbers. About 69% of those parts were restricted to approved sources, and only about 27% were openly competable. A basic NSN lookup tells you what a part is. The lookup that protects your margin tells you whether you can sell it, who else can, and what the government paid the last time it bought one.
TL;DR
- An NSN identifies an item, not a supplier. The 13 digits tell you what the part is. The approved-source list and the acquisition codes tell you who can sell it.
- Approved status comes first. Of the parts on open DIBBS solicitations, about 69% are restricted to approved sources. On about 25%, the part is restricted and DLA lists exactly one approved supplier.
- Your CAGE code is not the only way in. Federal rules leave room for a dealer or distributor offering a part made by an approved source, as long as you can prove where it came from.
- Price history needs careful reading. Award prices are useful only when you compare the same unit of issue, a similar quantity, and a recent date.
- Approval is a path, not a wall. A Source Approval Request can add your company to the list for a specific part, and DoD policy says a firm cannot be denied the chance to demonstrate that it qualifies.
- CLEATUS tells you when your approved parts are being bought. It matches your CAGE against open DIBBS solicitations and notifies you, and it puts all 17 million stock numbers, their approved sources, and their award history in one place.
What an NSN Lookup Should Tell You
A National Stock Number is the 13-digit identifier the federal supply system assigns to an item of supply. Take 5305-00-984-6215. The first four digits are the Federal Supply Class, which groups the item with similar items. The last nine digits are the National Item Identification Number (NIIN), and that part is what makes the item unique. The first two NIIN digits name the national codification bureau that cataloged the item, and the last seven are a serial number.
The structure explains a common search problem. The same item appears as a dashed NSN on one document, a compact 13-digit string on another, and a bare NIIN in a spreadsheet. Because a Federal Supply Class can be reassigned while the NIIN stays fixed, the NIIN is the most durable key when you match records across systems.
Most NSN lookup tools stop at the catalog record: item name, class, and a list of part numbers. Those facts are necessary, but they will not tell you whether to quote. Before you price a part, a useful lookup answers five questions.
- What exactly is this item? Confirm the item name, the unit of issue, and the manufacturer part numbers tied to the stock number.
- Is it open or restricted? Read the acquisition codes that say how the government can buy the part.
- Who is approved to supply it? Find the CAGE codes on the approved-source list and the part number attached to each one.
- What has DLA paid? Pull comparable awards, with dates, quantities, and unit prices.
- Is anyone buying it now? Check for an open RFQ, and see how often the part has been solicited.
How to Read AMC and AMSC Codes
Every part that goes through the Department of Defense's spare parts breakout screening receives two codes: an Acquisition Method Code (AMC) and an Acquisition Method Suffix Code (AMSC). Both are defined in DFARS PGI 217.7506. The AMC is a single digit that gives the result of the technical review. The AMSC is a single letter that explains why.
| AMC | What it means |
|---|---|
| 0 | Never assigned a code and never completed screening |
| 1 | Suitable for competitive acquisition for the second or subsequent time |
| 2 | Suitable for competitive acquisition for the first time |
| 3 | Acquire directly from the actual manufacturer, for the second or subsequent time |
| 4 | Acquire directly from the actual manufacturer, for the first time |
| 5 | Acquire directly from a sole source contractor that is not the actual manufacturer |
The suffix carries more of the bidding decision. The PGI states that AMSC G is the only suffix that implies a part is a candidate for full and open competition. Other suffixes can still allow limited competition when two or more independent sources exist, so a restricted code does not always mean a single supplier.
| AMSC | What the code says | How to read it |
|---|---|---|
| G | The government has rights to the technical data, the data package is complete, and no technical, engineering, tooling, or manufacturing restrictions apply | Openly competable. The approved-source list shows past suppliers, not a gate. |
| C | The part requires engineering source approval by the design control activity | An alternate source must qualify. Look at a Source Approval Request if the demand justifies it. |
| B | The part must come from a manufacturing source specified on a source control or selected item drawing | Treat as closed unless your source is the one specified. |
| D, H | The data needed to buy competitively is not available, or the government lacks sufficient, accurate, or legible data | A data problem, not necessarily a design lock. H is a temporary code during screening. |
| P, R | The government does not own the data rights, and obtaining them or reverse engineering is uneconomical | A long-term restriction. Plan around the rights holder. |
| Q | The government lacks adequate data or rights, but expects to achieve competition | Watch it. The status may open up. |
| S | Restricted to government-approved sources because production involves militarily sensitive technology | Expect added vetting of any new source. |
| T | Controlled by Qualified Products List procedures | You must be listed, or qualified for listing, at the time of award. |
| Z | A commercial off-the-shelf item, other commercial product, or nondevelopmental item | Check the solicitation for the sources DLA will accept. |
| O or none | The part never completed screening, or no code was published | Unknown is not restricted. Ask the buyer before you spend quote time. |
One complication catches experienced suppliers. An AMSC belongs to a part and a managing service together, so a part can carry different codes across the services that manage it. When you quote on DIBBS, the code on DLA's own management record is the one to read. Also compare the catalog code with the solicitation itself, because the solicitation governs that buy.
NSN Approved Vendor Status: What It Means for Your Quote
The term "approved vendor" causes confusion because the list is built from manufacturers and part numbers, not from everyone who can sell the item. Each entry pairs a CAGE code with that company's part number. That pairing is the detail to check. A listed company offering a different part number from the one on the list has not satisfied the same requirement.
Here is what the open DIBBS board looked like on November 9, 2026, across 18,184 distinct stock numbers:
| Status of the part | Parts | Share |
|---|---|---|
Restricted to approved sources (a known AMSC other than G) | 12,529 | 69% |
| Openly competable (AMSC G) | 4,863 | 27% |
| No usable code published | 792 | 4% |
| Exactly one approved source listed | 6,723 | 37% |
| Restricted, with exactly one approved source listed | 4,613 | 25% |
The last two rows measure different things. A single listed source on an openly competable part only tells you who has supplied it. A single listed source on a restricted part is close to a closed buy for everyone else, and that describes one part in four on the board.
If you are a distributor or dealer
Your own CAGE code does not need to be on the list for every path. The breakout rules say restrictive codes do not preclude consideration of a surplus dealer or other nonmanufacturing source when the part offered was manufactured by an approved source, citing FAR 11.302. The offeror still has to prove that the part meets the government's requirements.
In practice, that proof is paperwork. DLA's Procurement Note C03 has contractors confirm that they hold, or will obtain before delivery, supply chain traceability documentation. The records cover the item description, part number, drawing or specification, NSN, and manufacturing source. Dealers and distributors must also name every intermediary between the manufacturer and themselves. The retention period is six years after final payment, and the contracting officer can cancel undelivered orders or reject delivered supplies if the documentation falls short. Secure the manufacturer relationship and the paper trail before you enter a price.
If you manufacture the part
A company that can build a restricted part has a formal route onto the list. A Source Approval Request (SAR) is a package that shows a prospective new supplier can produce the item at the same quality as the existing source or better. An Alternate Offer is the same kind of evaluation tied to an active solicitation. Approval is item-specific, so a SAR for one NSN does nothing for its neighbor. Critical items can also go to one or more Engineering Support Activities for review, which adds time. DLA publishes the requirements in its SAR and Alternate Offer guide.
You have more standing here than many suppliers assume. The PGI says no firm shall be denied the opportunity to demonstrate its ability to furnish a part that meets the government's needs, without regard to annual buy value, even where a restrictive code applies. If the government cannot resolve the request within 60 days, it must tell the offeror the status and give a good faith estimate of the completion date. You pay for your own demonstration, so pick parts that justify the cost: steady demand, a short source list, and a technical fit you can document.
A decision table for any part
| What the NSN lookup shows | What to do |
|---|---|
| Openly competable, and you can make or source it | Quote it. Confirm that you can get the technical data, and use the source list as competitive intelligence. |
| Restricted, and your CAGE and part number are listed | Quote it. You are in the competitive field. |
| Restricted, and you can buy from a listed manufacturer | Check the solicitation terms, get a current supplier price, and secure traceability first. |
| Restricted, and you can build an equivalent part | Weigh a SAR, or an Alternate Offer if a solicitation is active. Check the award history for demand. |
Restricted, one source, and you have no route to the part | Pass on this buy and spend the time elsewhere. |
| No usable code published | Ask the buyer about data availability and acceptable sources before you price it. |
NSN Price History: How to Use Past Awards
A past award is the closest thing to a price signal on a parts buy, and it is easy to misread. An old low price can be an unrepeatable surplus deal. A high one can be an emergency spot buy for three units. The number means something only after you put it in context.
Match the unit of issue. A price per each and a price per box of 100 can sit next to each other in the same history. Convert them before you compare.
Compare similar quantities. Unit prices often fall as quantity rises, so a 5,000-piece award is a poor benchmark for an order of 12. Look for awards near your quantity.
Weight recent awards. Materials, freight, and supplier pricing move. A five-year-old award deserves less weight than last quarter's, and an award from a decade ago mostly confirms that the part exists.
Know who won. If the awardee was a surplus dealer, your new-production cost may never reach that price. If it was the manufacturer buying direct, a distributor adding margin will have trouble matching it.
Treat public data as incomplete. DLA publishes yearly award files under the Freedom of Information Act, and they run back to 2013, but they leave out about a quarter of DLA's hardware awards, more of them large ones. A DIBBS award notice carries one total price, so a unit price derived from it is a calculation. RFQ documents also print their own purchase history for the part, and it is a summary. Use every source together, and treat any total as a floor.
Never skip a current cost. The DoD standard price in the catalog is a reference point, not what DLA paid the last supplier. Award history helps you estimate where a quote can land. Your supplier's price today, plus freight and any first article or testing requirement, tells you whether you should send one. For a broader price-to-win method, see our guide to price-to-win tools.
How to Find NSN Vendors and Manufacturers
There are three common reasons to look for a vendor, and each one starts from a different place.
You have a part and need a source. Start with the approved-source list for the NSN. Note each CAGE code and the part number attached to it, then confirm that the company is still active. Check the company's SAM record, because a CAGE code can outlive the business behind it. On a restricted part, the listed manufacturers are your supply options. On an openly competable part, the list is only a starting point, and any capable shop that can build to the technical data package can be your source.
You sell for a manufacturer and need its parts. Search by the manufacturer's CAGE code to see its catalog of approved parts, then rank those parts by recent DLA buying. Awardees on spot buys are often resellers, so a manufacturer can look small on award searches while DLA spends heavily on its parts. Counting spend by part, whoever won, gives you the truer picture of that manufacturer's value to a distributor.
You want to size up a competitor. Look at the parts a company is approved for, how many of those it is the only approved source on, and which supply classes it has no position in. Those gaps are where a new entrant has room. To reach those companies as partners instead, see how to find teaming partners in government contracting.
Before you sign up a new source, ask for three things: written authorization to resell, the traceability records you will need under Procurement Note C03, and a current quote with lead time. A source that cannot provide the second item will cost you the award later.
Why an NSN Lookup Alone Isn't Enough
The data behind an NSN is public, and DLA's own tools are the authoritative record. The difficulty is that the facts live in different places, and none of them comes to you when a buy appears.
| What you need | Government sources | CLEATUS |
|---|---|---|
| Find a part without its NSN | Code-first searches across separate systems | Search by NSN, part number, or item name |
| Open or restricted | Raw AMC and AMSC codes to interpret yourself | A plain status on every part and solicitation |
| Alerts | DIBBS email alerts by Federal Supply Class | Notified when a solicitation names a part your CAGE is approved for |
| Competitor parts | Assembled by hand from catalog files | Every NSN a CAGE is approved for, with sole-source counts |
| Awards and prices | Award notices, RFQ documents, and yearly files | Connected to the part, the company, and the solicitation |
The alert row matters most. An alert by supply class tells you that something in a category appeared. It cannot tell you whether you are allowed to win it. With a board where 69% of parts are restricted, a category feed sends you mostly parts you cannot quote, and approved-part work gets buried in the volume. If you are new to the portal itself, start with our DIBBS guide, which covers registration, login, and how the board works.
How CLEATUS Turns an NSN Lookup Into a Bid Decision
CLEATUS brings the catalog, the approved-source records, the solicitations, and the award history together, then puts agents to work on them.
Approved-part matches come to you. CLEATUS checks your CAGE against the parts on open DIBBS solicitations and notifies you when DLA is buying something you are approved to supply. These matches reach your recommendations on the strength of DLA's own approved-source record, so a thin parts description does not hide them.
Your whole supplier list stays covered. Distributors do not sell only under their own CAGE code. GovCon Copilot can search every live DIBBS solicitation across a full list of manufacturer CAGE codes in one request. An AI Workflow can run that same check on a schedule and send the results to your team.
Every part answers the first questions on one page. NSN Lookup covers all 17 million stock numbers in DLA's catalog. Each part page shows what the item is, its DoD standard price and unit of issue, its approved suppliers, whether it is "Openly competable" or "Approved source only," and the DIBBS solicitations and awards that named it. The public directory requires no account.
Vendor and competitor research runs both ways. Go from a part to its approved suppliers, or from any company in the contractor directory to every NSN it is approved for, with counts of sole-source, open, and restricted parts. Copilot can also pull the DLA award lines behind a manufacturer's parts, drawing on more than 12 million priced DLA award lines.
Screening and quote drafting happen together. DIBBS software in CLEATUS screens open solicitations against your own rules, uses available award history as the benchmark, applies your markup and delivery terms, and drafts a batch quote file. You review the prices and upload the file to DIBBS yourself. After an award, a post-award workflow can prepare the certificate of conformance and the shipment checklist.
Part research also feeds the wider work in Market Intelligence, so a DLA parts line sits in the same pipeline as your federal, state, and local opportunities. AI Workflows are part of the DATA + AI + Automations plan and higher.
"CLEATUS transformed our entire operation. We tripled our output with the same team and eliminated days of manual work."
– John Garnish, Business Development Lead, D2 Government Solutions
Frequently asked questions
Know Which Parts You Can Win Before You Price Them
A stock number on a solicitation is only the start of the research. The companies that do well on parts work check the approved source, read the code, compare the right awards, and spend quote time only where they have a route to the part. Have CLEATUS watch the board for the parts you can already supply, and put your attention on the decisions.
Further Reading
- DLA DIBBS: Login and How to Win DLA Contracts
- 8 Price-to-Win Tools for Government Contractors
- GovCon Market Research in 2026: How to Read an Agency Before the Solicitation Exists
- How to Find Teaming Partners in Government Contracting
- How to Generate Leads from Government Contract Awards
Customer Stories
- How D2 Government Solutions Tripled Growth Without Adding Staff
- How Operation Hired Achieved 6× Proposal Output with CLEATUS AI
- How a Veteran-Owned Shop Won Their First Contract with CLEATUS AI
About CLEATUS
CLEATUS is an agentic AI platform that helps government contractors discover the right opportunities, manage capture pipelines, and write winning proposals. Automate your GovCon operations end-to-end: build custom AI-powered automations that handle multi-step processes on autopilot, a force multiplier for your capture and BD team that works in the background while you stay in the loop on every decision. We aggregate federal, state, local, and city opportunities; our GovCon Copilot analyzes solicitations and your internal documents to deliver actionable market intelligence that drives revenue growth.
