References

Brain Nutrition
Digital Ocean IP/CIDR in CSV
ipset with firewalld
ipset man page
iptables man page
Microsoft Azure IP Blocks
networksdb.io

Blacklisting Countries

On Rocky/RedHat Linux

Blacklisting countries relatively easily using the bash script created below. It is however important to consider where blacklisting countries is in the iptables chain. At present this is only setup using bash for IPTables however a version for Windows Firewall with Advanced Security using Powershell is in the works. After that I will get one up for all you folks moving to Firewalld. This script is dependent on https://ipdeny.com which is a free service that runs out of Amsterdam Nethrelands. It is also dependent on IPTables as it builds rule sets in ipset for each country.