WorldIP - IP Geolocation, Internet Research

Opera browser users are able to go online through a special proxy server of the Opera. Also, Opera Mini mobile customers use these servers.

Of course, IP addresses belong to these servers, but they send header "X-Forwarded-For" with the real IP address of the user.

The list of Opera's proxies is helpful to determine the real country.

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Configuration and use of the database (CIDR) are very practical and comfortable in nginx, so there is no problem to install it
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WorldIP Free Geolocation Database

WorldIP Database helps determine exact geographic locations of Internet users based on their IP address. It supports all types of IP addresses and networks, including satellite networks. It is completely free for personal and business use, but we will be very glad, if you include a link back to WIPmania.com on your website.
The database is available for immediate download in any of the following formats
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