When I search for any name on that website, I see numbers as follows: "YYYYMMDD-XXXX" (with the "XXXX" parts being obfuscated). Do you mean it shows the full ID

When I search for any name on that website, I see numbers as follows: "YYYYMMDD-XXXX" (with the "XXXX" parts being obfuscated). Do you mean it shows the full ID if you sign up for their service? I would be surprised if so, but have never tried that before so I suppose it's possible (that's also generally how these services provide tax information - behind a registration and usually paywall, even though you can request it for free from the tax office yourself as well). Edit: I think you may be right and that registration and possibly payment could reveal the whole personnummer: https://www.imy.se/privatperson/dataskydd/introduktion-till-gdpr/vad-ar-personuppgifter/personnummer/ https://www.imy.se/privatperson/dataskydd/introduktion-till-... TIL!