The person y'all are downvoting is not technically incorrect if they're in the EEA, as this is exactly how GDPR treats it. Because there exists a party that can

The person y'all are downvoting is not technically incorrect if they're in the EEA, as this is exactly how GDPR treats it. Because there exists a party that can map it (your ISP), it's PII under that law. Of course this may be different in other jurisdictions.