Yes. IONOS is operated from Germany, has no non-EU parent company and runs its own infrastructure, so staysin.eu classifies it as EU-sovereign.
Majority owned by United Internet AG (Germany).
A provider counts as EU only when all three criteria hold:
Where a server physically sits is shown on each check but does not change the verdict: legal reach follows who controls the processing, not where the bytes are. Read the methodology.
Seen on 938 of 10871 checked domains (latest check per domain, as of 25 October 2026): as hosting on 332, as DNS on 673, as mail (MX) on 299, as CDN on 15, as mail sending (SPF) on 93, as third-party requests on 122.
Domains are those people chose to check on staysin.eu, not a representative sample of the web.
Recently checked domains using IONOS: