Definition: Identity Mapping Service ABB is a Technology service that establishes, maintains, and resolves relationships between digital identities originating from different identity providers and domains. Source: IAM industry practices Last modification: 2026-02-02 Identifier: http://data.europa.eu/dr8/IdentityMappingServiceTechnologyService LOST view: Technical view - infrastructure EIRA concept: eira:ArchitectureBuildingBlock ABB name: eira:IdentityMappingServiceTechnologyService Synonym: Identity Correlation Service , Identity Linking Service Example: Mapping a Belgian national eID number, an Estonian eID, and a European Student Identifier to the same person so that cross-border digital public services recognise the user as the same citizen. Interoperability Saliency: This ABB is essential for cross-border interoperability because it enables identity mapping across identity providers, national eID , and authentication domains, allowing public services to trust and recognise users. Additional information: Identity Mapping Service does not authenticate users. It resolves and links identities after authentication has taken place.It works together with Identity Providers and Access Management platforms to enable federated identity and Single Sign-On. Interoperability Dimension: Structural IoP Additional identifier: http://data.europa.eu/dr8/IdentityMappingServiceTechnologyService EIF Layer: TechnicalInfrastructure