This script helps block banned IPs using fail2ban in Linux

block_banned_ips.sh

#!/bin/bash

# Example: curl -s  https://gist.githubusercontent.com/ramit-mitra/f5e9c4f9adc4a155ebcce2608bc50f39/raw/block_banned_ips.sh | bash

url=https://raw.githubusercontent.com/ramit-mitra/blocklist-ipsets/main/rottenIPs.json

jail_names=($(fail2ban-client status | grep "Jail list" | sed -E 's/^[^:]+:[ \t]+//' | sed 's/,//g'))
blocked_ips=$(curl -s $url | jq -r '.[]')

echo "-------------------------"
echo "Reading Banlist IPs..."
echo "Banning IPs (this may take a while)..."

for jail in "${jail_names[@]}"; do
	echo "Banning IPs in jail_type:: $jail"
	echo "-------------------------"
	for ip in $blocked_ips; do
	  echo $ip
	  fail2ban-client set $jail banip $ip > /dev/null
	done
	echo "-------------------------"
done
echo "Done"