Agence d’urbanisme de la région de Saint-Nazaire

Agence d’urbanisme de la région de Saint-Nazaire (ADDRN) is an urban planning agency that supports the development and management of the Saint-Nazaire agglomeration in western France. Its core mission involves producing territorial diagnoses, drafting land‑use plans, and guiding urban development projects for the member municipalities. The agency provides technical expertise on housing, transportation, environmental quality, and public space design. It also assists local authorities in implementing regional planning policies and evaluating the impact of major infrastructure projects. Through studies, workshops, and cartographic tools, ADDRN helps translate strategic visions into actionable planning documents.

The organisation is headquartered in Saint-Nazaire, France, and operates primarily for the benefit of the city and its surrounding intercommunal structure. While specific staff numbers or budget figures are not disclosed in the available sources, the agency’s activities are directly linked to the municipal services that were affected during the April 2024 cyber incident. Those services include urban planning functions, identity document processing, social aid distribution, and library operations, all of which rely on the agency’s data and planning outputs. By maintaining geographic information systems and planning databases, ADDRN supports the day‑to‑day functioning of these municipal departments. Its work therefore reaches a broad spectrum of residents and businesses within the Saint-Nazaire agglomeration.

ADDRN is distinguished by its focus on integrated urban planning and its role as a technical advisor to local government entities within the region. The agency’s expertise is regularly mobilised in crisis situations, as evidenced by its collaboration with Orange Cyberdefense and the national cybersecurity agency ANSSI during the response to the 2024 crypto‑virus attack. This partnership highlights its capacity to engage with specialised cyber‑security partners while safeguarding essential planning information. Furthermore, the agency’s work intersects with regulatory frameworks governing land use, environmental protection, and urban renewal, positioning it at the interface of policy formulation and practical implementation. Its continued involvement in post‑incident diagnostics and system securing underscores its responsibility for maintaining the resilience of the territorial data infrastructure it manages.