Here you will find info on CEPT regulations and frequency usage in Europa. Download the PDF from the DARC website for information about what bands and frequencies you can use accross Europe, USA, Canada and Australia. I abandoned my Excel file for the already current PDF version of DARC, which saves me quite some work. :)

The maps below show the countries you can use your regular CEPT license and the country prefix you need to use. There are maps for Europe Full and Europe Novice. You can use your CEPT license in the coloured countries (they also have the prefix in them you should use, but check the PDF file for all the details!), not in the white ones. As you can see, a Full license will cover almost all of Europe, a Novice license is much more limited. If you are a Novice, consider upgrading. =8-)