Thanks, updated
Their urls do not feel very reliable

https://regnr.info/husker-ikke-hele-regnr?

Another Norwegian plate check site - this one is useful as you may search for the model and you get all the documented plates of the vehicle type in question. It's also very useful if you have some of the number plate digits available as it lists all cars with said digits.

Thanks, I added it

The slovak link doesn't answer anymore (error 403).

Just in case, here's another one : https://www.stkonline.sk/informacny-servis/ceny-technickej-a-emisnej-kontroly

Thanks

Found this website in a discussion about French plates on Avtonomer/Platesmania: https://autorigin.com/

To the French speakers of IMCDb (who can properly read the texts), is Autorigin any good? I actually ran the plates of several vehicles I have on Platesmania and whether it returned any info varied.

Interesting. I entered a random french plate number on Autorigin, and the good thing is, it showed most of the VIN. This can be useful.

VIN : VF3MCYHZJKS19****

It also shows basic data, like these :

Carburant : Gazole
Cylindrée : 1499
Couleur : NOIR
Places : 5

Oscaro.com only shows a single line, like this : PEUGEOT 3008 II 1.5 BlueHDi S&S 130 cv.

A combination of both sites would be better.