Update README.md

Information about CIDR setting
WKnak · Jun 28, 2024 · 4fddf48 · 4fddf48
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 # fail2ban block ip/network range (ipv4 only)
-A python script that group IPs into network range, to block attacks from a network range address, from CIDR /23 up to /31.
+A python script that group IPs into network range, to block attacks from a network range address, from CIDR /18 up to /30. (CIDR range now is configurable)
 
 📛 Please be carefull to not block youself!