The Schengen Information System (SIS) is the largest information-sharing system for security and border management in Europe. It allows national authorities — border guards, police, customs, visa and migration officials, and judicial authorities — to enter and consult alerts on wanted or missing persons, third-country nationals subject to entry bans, and lost or stolen objects such as vehicles, firearms, identity documents, and banknotes.
SIS was established to compensate for the lifting of internal border checks under the 1985 Schengen Agreement and the 1990 Convention Implementing the Schengen Agreement. The original system (SIS) became operational in 1995. It was succeeded by SIS II, which went live on 9 April 2013 after years of delays, and then upgraded again under a package of three regulations adopted in 2018 covering border checks, police cooperation, and the return of illegally staying third-country nationals. The renewed SIS entered into operation on 7 March 2023.
The system is operated centrally by eu-LISA (the EU Agency for the Operational Management of Large-Scale IT Systems in the Area of Freedom, Security and Justice), based in Tallinn and Strasbourg, while each participating state runs a national copy (N.SIS) and a SIRENE Bureau that handles supplementary information exchange.
For migration policy, the most relevant alert categories are refusals of entry and stay under the Return Directive framework, alerts on third-country nationals to be returned, and alerts on missing persons — including unaccompanied minors. Data protection is supervised by national authorities and the European Data Protection Supervisor; individuals have rights of access, rectification, and erasure.
SIS is used by all EU member states except Ireland (which participates only in the police-cooperation parts) and Cyprus, plus the four Schengen-associated states: Iceland, Norway, Switzerland, and Liechtenstein. It is a core component of EU interoperability efforts alongside VIS, Eurodac, EES, and ETIAS.
Example
In 2023, following the launch of the renewed SIS on 7 March, EU member states began issuing new alert categories on third-country nationals subject to return decisions, enabling Frontex and national border guards to track removals across the Schengen Area.
Frequently asked questions
Border guards, police, customs, visa, migration, and judicial authorities in participating states, plus Europol and Eurojust within their mandates. Access is role-based and logged.
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