WP Plugin : IP to Nation : this plugin guesses your visitors’ country according to their IP. It can be used for example to display a custom welcome message in a given language, or to display your commenters’ country flag. Worth to mention also is an alternative to this plugin, GeoIP.
I’m using this plugin and I think it’s great! A bit confusing to install at first, but I think there should be a bit more flags in their collection. Other than that, it’s cool.
also find: country, city, ISP: ip check