IP2Proxy C Module
To detect proxy servers with country, region, city, ISP and proxy type information using IP2Proxy binary database.
IP2Proxy database contains a list of daily-updated IP addresses which are being used as VPN servers, open proxies, web proxies, Tor exit nodes, search engine robots, data center ranges, residential proxies, consumer privacy networks, and enterprise private networks. The database includes records for IPv4 addresses.
You can access to the commercial databases from https://www.ip2location.com/proxy-database or use the free IP2Proxy LITE database from http://lite.ip2location.com
For more details, please visit: http://www.ip2location.com/ip2proxy/developers/c