When it comes to the question of whether an IP address is personal or not, Google seems to swing both ways.
In February, Google software engineer Alma Whitten wrote Are IP addresses personal? on the Google Public Policy blog. In the posting she said "... in most cases, an IP address without additional information cannot [identify you]."
But someone commenting on the posting pointed out that Gmail goes out of its way to hide the IP address of the sender of a Gmail-originated message. The item User IP addresses from the Gmail help says:
"Protecting our users' privacy … Read more