The German Federal Court of Justice has been asked to rule on whether IP addresses (including dynamic IP addresses) are personal data. The issue has arisen in proceedings by the Pirate Party delegate, Patrick Breyer, against the Federal Republic of Germany in which he claims   that the Republic stored the IP addresses of Pirate Party website users without consent, contrary to data protection laws. It is likely that the court will refer the question to the Court of Justice of the European Union. 

News release – German Federal Court of Justice (in German)