WP Statistics supports IPv6 as of version 11.0, however, PHP must be compiled with IPv6 support enabled, otherwise you may see warnings when a visitor from an IPv6 address hits your site.
You can check if IPv6 support is enabled in PHP by visiting the “Optimization -> Resources/Information -> Version Info- > PHP IPv6 Enabled” section.
If IPv6 is not enabled, you may see an warning like:
Warning: inet_pton() [function.inet-pton]: Unrecognized address 2003:0006:1507:5d71:6114:d8bd:80c2:1090
