The Trans European Services for Telematics between Administrations (TESTA) system is the private IP-based network of the European Community. TESTA is a telecommunications interconnection platform for secure information exchange between the European public administrations.

TESTA is not a single network, but a network of networks, composed of the EuroDomain backbone and Local Domain networks. The EuroDomain is a European backbone network for administrative data exchanges acting as a network communication platform between local administrations.