This plugin can detect information such as country name, web browser and operating system from your commenters and then displays them on your comment section or anywhere you like.

Features:

• Detects and shows commenter’s country flag, web browser and operating system automatically
• Supports many web browsers and operating systems: major desktop browsers, antiquated browsers, blogging software (for trackbacks and pingbacks), text based browsers, various PDAs and cell phones.
• Uses a binay file for IP to country resolution and supports database sources from Webhosting.info – Software77.net
• The returned string can be configed as a template to suite your theme

Here is screen shoot of plugin