Social sorting of migrants and travellers based on data stored in information systems is at the centre of border controls and mobility management in Europe. Recent literature finds that the inclusion-exclusion distinction is insufficiently equipped to do justice to the variety of classifications that is being applied. Instead, a proliferation of refined categorizations determines the outcome of visa and permit applications. This article explores the ‘administrative ecology’ in between the two extremes of inclusion and exclusion. It claims information technologies encourage the emergence of an intermediary category of ‘non-publics’ situated between the level of groups and the level of individuals. The ontological and normative status of these ‘non-publics’ will be analysed by using some key notions of Actor-Network Theory.