Free NSN Lookup
Enter a 13-digit National Stock Number to see the item name, part numbers and CAGE codes recorded against it. Free, no account.
Results also show the NIIN and Federal Supply Class. Covers aviation supply classes from public DLA data. See what is covered.
The lookup needs JavaScript. Everything below is readable without it.
What this tool does
It answers one question: what does the public federal catalogue record against this stock number? You enter an NSN and get back the item name and each reference number filed against the item, with the CAGE code it is filed under.
The data is a stored copy of one public table from the Defense Logistics Agency, limited to 31 aviation supply classes: 1,022,978 reference rows covering 558,844 stock numbers. honest.aero is a private website and is not affiliated with DLA.
What an NSN is
A National Stock Number is a 13-digit number that identifies an item of supply. It identifies the item. It is not a statement that the item is in stock anywhere. It is written in four groups, 4-2-3-4:
| Part of the number | Meaning |
|---|---|
| 1620Federal Supply Class (FSC) | What kind of item it is. 1620 is aircraft landing gear components. |
| 01National Codification Bureau code | The country that catalogued the item. 00 and 01 are the United States. |
| 003-0911Item number | A serial assigned by that bureau. It has no meaning of its own. |
| 01-003-0911NIIN | The last nine digits together: the National Item Identification Number. It identifies the item even if its class is later reassigned. |
Every digit counts, including leading zeroes. This tool keeps what you type as text and never converts it to a number. The structure above follows the Defense Logistics Agency’s own description of the NSN.
How to search
Type all 13 digits. Hyphens or spaces in the 4-2-3-4 positions are optional. The tool does not guess: a NIIN on its own, a part number, or separators in the wrong places are reported, not corrected. Three real stock numbers to try:
| NSN to try | What you will see |
|---|---|
| 1620-01-003-0911One reference | A single part number under a single CAGE code. |
| 1680-01-003-3564Several references | The same part number recorded under three different CAGE codes. Three rows, and the tool does not pick one. |
| 2840-00-210-6069A long list | More references than the tool lists. Results are paged and capped. |
Examples were picked from the public data by fixed rules, such as the stock number with the most references. They are not recommendations and imply nothing about supply.
Reading a result
| Field | What it is |
|---|---|
| NSN, NIIN, class | The number you entered, split into its parts, with the class title. |
| Item name | The catalogue’s approved name for the item, such as PARTS KIT,LANDING GEAR,OVERHAUL. |
| Reference part number | A number recorded against the item, exactly as published. One row each. Some are national catalogue index numbers, not manufacturer part numbers; the tool shows every row and does not classify them. |
| CAGE code | The five-character code of the organisation that reference is filed under. |
| Name on CAGE record | The name the data prints beside that code. It is a register entry. It is not a statement of who manufactures the part or who may supply it. |
What a match does not establish
- Interchangeability. Several references on one stock number are separate catalogue records. Whether one may replace another is decided by the approved data for the aircraft.
- The manufacturer or an approved source. A CAGE reference does not show who makes the part, that a registration is current, or that anyone is an approved source for a solicitation.
- Stock or price. Nothing here says a part is available, what it costs or how long it takes.
- Certification. A reference says nothing about release paperwork, trace or condition.
- Eligibility to quote. A solicitation sets its own approved sources and requirements. Read the solicitation.
No result, outside coverage, or unavailable
These are three different answers and the tool names each one.
- No reference found. The class is one we cover, the data was read, and it holds no reference row for that NIIN. The stock number may be newer than the snapshot, cancelled, recorded without a reference number, or left out of the public release because it is restricted or proprietary.
- Outside coverage. The class is not one we load. This says nothing about the stock number itself.
- Lookup unavailable. The data could not be read, so nothing was checked. It is never shown as “no result”.
In all three cases you can still ask us to source the item.
Requesting sourcing
When a lookup returns the item you need, select the reference you want and choose Request sourcing. The request carries the stock number and the exact reference you picked. You then add:
- Quantity and unit. The unit matters: 5 in hundreds is 500 pieces. Units offered: each (EA), pair (PR), set (SE), kit (KT), assembly (AY), foot (FT), hundred (HD).
- Acceptable conditions. NE New, NS New Surplus, FN Factory New, OH Overhauled, SV Serviceable, AR As Removed, RP Repairable. Leave them all unselected if you have no constraint.
- Needed-by date, if you have one, and whether the aircraft is on ground.
- Your name and email, so a person can reply.
Not sure which reference applies? Choose “I’m not sure which one I need” instead of picking one. We work from the NSN and confirm the exact part with you before sourcing anything. We do not choose an equivalent on your behalf.
A person reads every request and looks for current supply. No supplier is contacted at the moment you press send, and nothing is quoted automatically. For a list of parts, send one RFQ.
Data source and coverage
| Source | Defense Logistics Agency, PUB LOG, table P_PART_PICK. DLA describes PUB LOG as publicly releasable logistics information, free to download and updated monthly. It leaves out restricted and proprietary data, so some stock numbers are not in it at all. |
|---|---|
| Coverage | 31 aviation Federal Supply Classes, listed below. 1,022,978 reference rows, 558,844 stock numbers. |
| Snapshot taken | . Each result also shows the date the data was loaded into this tool. |
| PUB LOG edition | Reported to us as OCT 2026. We have not verified this independently. It is the label our upstream copy carries for its load, taken on its word. |
| Refresh | By hand, when a newer edition is imported. DLA publishes monthly; this copy has no schedule and is not a live connection to DLA. |
| Fields loaded | Class, NIIN, CAGE code, reference number, item name, name on the CAGE record. Not loaded: item characteristics, management data, prices, interchangeability and substitution data, the CAGE address file. |
Classes were chosen from the government’s own classification by what each class is for. General hardware such as rivets, nuts, bolts, bearings, seals and electrical connectors is not covered, and neither is any non-aviation class; those return an “outside coverage” result. A stock number shows up to 200 references, 25 at a time.
Aircraft and airframe structure (Group 15)
- 1510 Aircraft, fixed wing
- 1520 Aircraft, rotary wing
- 1550 Unmanned aircraft
- 1560 Airframe structural components
Aircraft components and accessories (Group 16)
- 1610 Aircraft propellers and components
- 1615 Helicopter rotor blades, drive mechanisms and components
- 1620 Aircraft landing gear components
- 1630 Aircraft wheel and brake systems
- 1640 Aircraft control cable products
- 1650 Aircraft hydraulic, vacuum and de-icing system components
- 1660 Aircraft air conditioning, heating and pressurizing equipment
- 1670 Parachutes; aerial pick-up, delivery and recovery systems; cargo tie-down equipment
- 1675 Space vehicle components
- 1677 Space vehicle remote control systems
- 1680 Miscellaneous aircraft accessories and components
Aircraft engines and engine accessories (Groups 28 and 29)
- 2810 Gasoline reciprocating engines, aircraft; and components
- 2840 Gas turbines and jet engines, aircraft; and components
- 2915 Engine fuel system components, aircraft and missile
- 2925 Engine electrical system components, aircraft
- 2935 Engine cooling system components, aircraft
- 2945 Engine air and oil filters, strainers and cleaners, aircraft
- 2950 Turbosuperchargers and components
- 2995 Miscellaneous engine accessories, aircraft
Flight instruments and airborne electronics (Groups 58, 63 and 66)
- 5821 Radio and television communication equipment, airborne
- 5826 Radio navigation equipment, airborne
- 5841 Radar equipment, airborne
- 6340 Aircraft alarm and signal systems
- 6605 Navigational instruments
- 6610 Flight instruments
- 6615 Automatic pilot mechanisms and airborne gyro components
- 6620 Engine instruments
Questions buyers ask
Yes. There is no account, no sign-up and no limit on ordinary use. A technical limit stops automated bulk querying, and a person looking up stock numbers one at a time will not meet it.
No. This tool takes a full 13-digit NSN and nothing else. A 9-digit NIIN is not accepted on its own, because the tool will not guess the class in front of it. Part numbers and CAGE codes appear in results; they are not search inputs here. For a CAGE code, use the official CAGE search. For a part number we have published pricing on, use Find a part.
No. An NSN identifies an item of supply. A result shows what is recorded against that item; it says nothing about stock, price, lead time or whether anyone can deliver it today. To find out, send a sourcing request.
Not on that basis alone. A shared NSN means both numbers are recorded against one item of supply. It is a cataloguing fact. Whether one part may replace another on an aircraft is decided by the approved data for that aircraft.
Not necessarily. A CAGE code names the organisation a reference number is filed under. That can be a manufacturer, a design authority, a distributor, a government activity or a national codification bureau. It does not show that a registration is current, and it does not make that organisation an approved source for a solicitation.
The tool tells you which of three things happened. The class may be one we do not load. The class may be covered but the snapshot holds no reference row for that NIIN. Or the lookup could not run, in which case nothing was checked. None of the three means the stock number does not exist.
The snapshot was taken on 13 October 2026. It is a stored copy, not a live connection to DLA, and it is refreshed by hand when a newer PUB LOG edition is imported; there is no schedule. For anything contractual, confirm against the current government source.
No. honest.aero is a private website. It reads public data published by the Defense Logistics Agency and is not affiliated with, endorsed by or operated for DLA or any government body.
Published by honest.aero. Page last updated . How we handle data generally is described in our methodology.