Weird looking Gmail location history

Question

Starting from today the IP addresses look like this:

So what gives?

Answer 1

Those are IPv6 IP addresses.

The IPv4 address space ran out of room some time ago. IPv6 has 7.9×10²⁸ more available addresses than IPv4, so we won't run out of addresses for quite a while.

Nothing to worry about. In fact, it's good that your ISP is finally supporting IPv6.