staysin.eu

eu is a free online service that assesses whether a domain's infrastructure and data handling remain within the European Union. The platform addresses concerns about digital sovereignty by analyzing multiple layers of a website's technical setup to determine if any part of its data flow or service provision involves non-EU jurisdictions. This is particularly relevant for organizations and individuals seeking to comply with EU regulations and minimize legal risks associated with data leaving the EU, such as exposure to foreign surveillance laws.

The tool examines seven distinct aspects of a domain: hosting provider, DNS nameservers, content delivery network (CDN), mail servers (MX), server location, TLS certificate issuer, domain registrar, and third-party requests loaded by the website. eu checks whether the provider is based in the EU or if the associated IP addresses are within the EU. The country determination process prioritizes the operator's ASN to reflect legal jurisdiction, with IP geolocation as a fallback. Server location always relies on IP geolocation to show the physical path of data.

Scoring is central to the platform's methodology. Each of the main services—hosting, DNS, CDN, mail, server location, and third-party requests—contributes equally to a score ranging from 0 to 100. Services operated within the EU add to the score, while those outside the EU subtract from it. Informational elements such as the TLS certificate authority and domain registrar are displayed but do not influence the score.

eu is delivered as a web-based tool and does not require installation or payment. It is developed by enum, a European infrastructure company, and operates without advertisements. The platform is intended for anyone interested in understanding and improving the EU sovereignty of their website or domain.