http://ip-lookup.net does a horrid job with foreign IP addresses (generally failing to find anything). Is there another more reliable service that isn't as bad that can be plugged in for IPv6 lookups?
Thanks for the feedback; I've done my own tests also and it seems to be better. Unfortunately at the time, the default IP info site didn't support IPv6 hence why that one was introduced.
We've changed this for XF 1.5.2. We have decided to affect the default value (for new installs) but where the existing value of that option is the old ip info site on upgrade, we are updating that to the original site, too.