The GDPR and this very case law say that an IP address in isolation and in general is not personal data. Indeed, the case law explicitly says that an IP addres

The GDPR and this very case law say that an IP address in isolation and in general is not personal data. Indeed, the case law explicitly says that an IP address is personal data IF the controller has or has a way to get additional data to make the person identifiable (which is what the GDPR already explicitly say). No-one is identifiable with an IP address only, there must be additional data, which I need to possess or have access to, even if only in specific cases (which is the key point of this German case law).