UEI Number Lookup: How to Find a Unique Entity ID

You can look up any active entity's Unique Entity ID (UEI) for free on SAM.gov — UEIs are public information. Go to SAM.gov's Entity Information search, type the organization's legal name (or its CAGE code), and the 12-character UEI appears on the public record. This works for your own organization and for prime contractors, teaming partners, and competitors alike.

Below is exactly how to do it, plus how to find your own UEI when you're signed in.

How to look up another company's UEI

Go to sam.gov (no login required for public search).
In the search bar, select Entity Information as the domain.
Enter the organization's legal business name. Use the legal name on file, not a "doing business as" name, for best results.
Open the matching result. The UEI is shown at the top of the public entity record, next to the legal name and CAGE code.

If a name returns several results (common for large companies with multiple registrations), match on physical address or CAGE code to pick the right record.

How to find your own UEI

If your organization already has an active SAM.gov registration:

Sign in at sam.gov with your Login.gov credentials.
Open your Workspace.
Your UEI is displayed directly beneath your legal business name on your entity tile.

You can also use the same public Entity Information search described above — your own UEI is public too.

Don't have a registration yet? There's nothing to look up until you register. See how to get a UEI number.

Can I look up a UEI by DUNS number?

Partially. Because DUNS was retired federally on April 4, 2022, SAM.gov no longer searches primarily by DUNS. However, records that migrated from the DUNS era retain the historical DUNS value, and you can often still find an entity by searching its name and confirming against the legacy DUNS on the record. Going forward, treat the UEI — not DUNS — as the lookup key. For background, see Unique Entity ID (UEI) explained.

Look up a UEI by CAGE code

If you have a CAGE code but not the UEI, search SAM.gov Entity Information and enter the CAGE code in the search field. CAGE and UEI are bound to the same entity record, so the UEI will appear on the result.

What you can (and can't) see on a public record

A public SAM.gov entity record typically shows:

Legal business name and any DBA
UEI and CAGE code
Physical address and registration status (Active/Expired)
NAICS codes and business types/certifications (if the entity opted to display them)

What you won't see publicly: banking/payment details, points of contact marked private, and reps-and-certs internals. Entities can also opt their record out of public search, in which case it won't appear at all.

Common lookup problems

"The company doesn't show up." Their registration may be expired (expired records can drop from public search) or they opted out of public visibility. Try the exact legal name or CAGE code.

"Multiple records with the same name." Large organizations register multiple locations, each with its own UEI. Match on address or CAGE to select the correct one — UEIs are per legal entity/registration, so this is expected.

"I found an old UEI on a contract that doesn't match." The contract may reference a superseded record. Confirm the current UEI on the live SAM.gov record and raise any mismatch with the contracting officer.

Frequently asked questions

Is UEI lookup free? Yes. SAM.gov entity search is free and requires no login for public records. Never pay a third party for a UEI lookup.

Can I find any company's UEI? Any entity with an active, publicly visible SAM.gov registration, yes. Entities that opted out of public search or whose registration expired may not appear.

How do I find my company's UEI fast? Sign in to SAM.gov → Workspace → it's under your legal name. Or search your legal name in public Entity Information.

Key takeaways

UEIs are public and free to look up on SAM.gov's Entity Information search.
Search by legal name or CAGE code; match on address when names collide.
Your own UEI lives in your SAM.gov Workspace under your legal name.
Need help understanding the result? Read what does UEI stand for and UEI number format.