In Belgium, registration in the Population Register is a prerequisite for access to social rights, as well as an indicator of integration and social recognition. For homeless people, an administrative system has been set up: the reference address. Among other things, this allows the person to be registered in the population register and to obtain a legal and administrative existence. However, today, its application differs from one social welfare organization (called CPAS) to another, the controls being most of the time driven by the fight against social fraud, itself defined by a specific policy of each CPAS.