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An error occurred while saving the commentAnonymous commented
The Plesk firewall already can blocks of networks, by adding a CDIR netmask.
In your example, use 18.104.22.168/16 to block all traffic from the 2.10 network.
However, this does not block data from a specific country, but from a specific (group of) network(s). Keep in mind that countries may have a lot of A/B/C type of networks that are not consecutively ordered.
I don't know any complete list of networks used in a specific country, but you can do a search at organisations like ripe.net, apnic.net, afriinc.net and arin.net to do research for networks.