ID Registry Catalog

Each registry issues an identifier used to match records across systems. Registries are keyed by a three-part <schema>:<scope>:<prop>code (for example, org:us:ein for the Organization schema), which doubles as the map key in an identifier collection. For the full rationale, see ADR-0023: Organization identifiers.

awd:us:fain

DescriptionIdentifier the awarding agency assigns to a specific federal award. Reported to USAspending and used to track award activity.

Federal Award Identification Number

governmentawdusbase

opp:grants.gov:system

DescriptionSystem-assigned identifier for an opportunity within Grants.gov. Locates and updates the opportunity record in that platform.

Grants.gov Opportunity ID

platformoppgrants.gov

opp:us:aln

DescriptionProgram identifier from the U.S. federal assistance listings (formerly the CFDA number). Ties an opportunity to its funding program.

Assistance Listing Number

governmentoppusbase

opp:us:fon

DescriptionAgency-assigned funding opportunity number that appears on the published notice of funding opportunity. Format varies by agency.

Federal Opportunity Number

governmentoppusbase

org:grants.gov:system

DescriptionSystem-assigned identifier for an organization within Grants.gov. Locates and updates the organization record in that platform.

Grants.gov Organization ID

platformorggrants.gov

org:us:ein

DescriptionNine-digit tax identifier the IRS assigns to U.S. organizations. Widely used to match organizations across federal award data.

Employer Identification Number

governmentorgusbase

org:us:uei

DescriptionTwelve-character alphanumeric identifier issued through SAM.gov, replacing DUNS as the primary U.S. federal entity identifier.

Unique Entity Identifier

governmentorgusbase

org:xi:duns

DescriptionNine-digit identifier issued by Dun & Bradstreet. Formerly the primary U.S. federal entity identifier; retained for historical matching.

DUNS Number

commercialorgxibase

8 registries3 schemas3 kinds