I don't know what's wrong with the
australian site given in IMCDb links, but it doesn't work on my computer. No problema, I was just given a new one:
http://vre.vicroads.vic.gov.au/
Just check the "I understand..." and click on "Continue". The search can be done on the registration number, the VIN (
Vehicle identification number) or the chassis number.
I also found some times ago
a site for the new French plate system: it's not an official one, just a site based upon official statistics and data, and aimed to give the date of arrival of a number you'd like to have on your vehicle: for example, if you want your car to have the MB-300-SL registration number, you'll have to wait until 05/03/2031
But it can also give you the date of (new system) plates
already allocated.
/!\ The new system (SIV) gives French cars a life-long registration number since April 2009. So knowing the date of the plate allows more or less to know the "date of birth" of the car (which could have stayed some months at the dealer's store before being registered). But pre-2009 cars will also be given an SIV number.
So keep in mind this tools is really trustworthy only for vehicles unveiled for sure after mid-2009.