I am curious though: my IPv6 network begins with 2600::, which I feel is not an accident or mere coincidence. For a long time, Facebook would never "trust" my device, and I suspected it was because of the IPv6 thing.
Now, "2600" is actually a hex number and doesn't mean 2600 decimal, but 2600 is an interesting prefix for a stable address. Could it mean that my ISP has permanently branded me as some sort of "hacker", and "2600" is network admin code for "please don't trust these devices"?
We should compare notes and see if other HN users have come up with stable prefixes like this, or different prefixes that aren't "2600".