Created a quick Python script to convert nginx blacklist to iptables entries.
You can find the entries in output.txt
VPN blacklist
https://www.lowendtalk.com/discussion/44388/vpn-ip-blacklist
https://github.com/Zalvie/nginx_block_files
Better to use iptables than nginx, so it doesn't waste processor cycles.
https://serverfault.com/questions/432716/where-to-place-nginx-ip-blacklist-config-file
https://www.cyberciti.biz/faq/how-do-i-block-an-ip-on-my-linux-server