Since upgrading my Piwik installation to 2.15.0, I’m not seeing any ISP/provider information from the real time data. Looking at the Geolocation set-up, the PHP (PECL) module is detected and the ISP is detected. The system shows that it can figure out the City and ISP.
I’m running Apache 2.4.17, PHP 5.6.14, GeoIP PECL module 1.0.8, CentOS 7.1. Running cPanel/WHM too.