You can easily know details of user filling up contact form in your WordPress site.
First of all make sure Contact Form 7 is installed and working on your WordPress site then,
Start by installing and activating Contact Form 7 Lead info with country in WordPress
Upon activation, all you need to do is add the [tracking-info] shortcode in the message body of your contact form and that’s it. Tracking is on.
How Contact Form 7 Lead Info With Country works?
The plugin simply adds the user details in email of Contact Form 7 plugin, as shown in the given screenshot.
This plugin is an enhanced version of the plugin Contact Form 7 Leads Tracking. It includes translations, tracks IP and the country.