the link to the swedish vägverket (roadworks) similar to the dutch rijkswaterstaat and rdw combined, the handle everything that has to do with traffic.

http://www.vv.se/

and the direct link to the reg nr page:
https://www21.vv.se/fordonsfraga/

if the link doesn't work follow the next steps

to find a car matching to a number plate, click Fordon (vehicle) in the left menu
then on the fordon page, click Sök fordons- & ägaruppgift (search vehicle and owner registration) in the left menu
on the next page click Sök uppgifter om annat fordon (search registration of other vehicle)

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