IPV6 Monitoring

I noticed recently that a visitor to my website was using a IPV6 IP address versus the standard IPV4 address. From a webmaster point of view, how do I learn more about a particular IPV6 address (such as city, state location) and how would I use a IPV6 address in a .htaccess file in the event I wanted to ban them.

Here is a sample IPV6 address from one of my log files and I couldn’t find any tools to help my analyze this IP address: