The EU plate is a white plate with black lettering. On the left side it has a blue stripe with the country code (the same one you used to have on these oval shaped white stickers, e.g. GB
for the UK, D for Germany, USA for... guess what?
) The actual coding depends on the respective country, e.g the example you´ve given looks to me like a Spanish plate from Barcelona. In Germany it would be first a one to three letter code for the community (county) where the car is currently registered (you´ll have to reregister your car in your new place of residence within one week, getting new number plates, if you move)), then a dash, behind it two random letters and then a random up to four digit number (B-AH4567, a car registered in Berlin, OHV-GH456, a car registered in Oberhavel Landkreis (county)). If it is only a number after the dash it means it is a government owned car. Certain letters are excluded like Nazi abreviations (KZ, NS, SS
). There exist some other number plates for export (no customs duty), test driving (insurance cover limited to a few days) and time limited number plate (e.g. a number plate for a motorbike only used in summer, valid from april to october, saves tax and insurance)
In Germany many US miltary installations adopted the EU number plates, but with USA printed in the blue field, looking like German plates but with a fictional town code, as to make it more difficult for terrorists to identify American military personnel.
Irish number plates look approximately like this:
03MH789 This means a car registered first time in 2003 in county Monaghan
, the number after the letters is random.
Or 96D4567, registered first time in Dublin in 1996.
In Ireland a car keeps the same number for it´s whole life, no matter where it is sold or operated.
Hope this helps,