https://bluecatnetworks.com/blog/is-an-ip-address-pii-the-an... may provide some insight.
IPs are sometimes PII. It seems that if you're the ISP, the IP is PII, but if you're a website, the IP alone may NOT be PII.
IPs are sometimes PII. It seems that if you're the ISP, the IP is PII, but if you're a website, the IP alone may NOT be PII.
The case specifically was that in the local jurisdiction, there's a law that if a company gets DDOSed they can request the local regulator to ask the ISP to identify a user. This law only gets triggered in very exceptional circumstances, but its existence means that IP addresses are always personal data in that jurisdiction. While that law only covers one part of Germany, the analysis applies to any similar law, of which it is safe to assume there are many.