As part of Googles security you are provided with alerts when your password is changed, if you do not reckonize the location and IP address you can report it. I received about 4 notifications of my password being changed with IP addresses and locations. However two of the alerts have IP addresses in a form I have never seen. My question is what kind of IP address are these
Those are for a new(er) form of addressing called IPv6.
In short, they made IP addresses in version 6 of the Internet Protocol service into something with much larger numbers that give us literally tens of billions more addresses than IPv4 (what we use today) gave us.
This [URL="http://en.wikipedia.org/wiki/IPv6"]Wikipedia article[/URL] has a pretty good rundown.