Fail2ban partial IP match possible?
Solution 1:
Short Answer:
Fail2ban plans to support banning of Subnets in Version 1.0.
Reference
Bug Report: https://github.com/fail2ban/fail2ban/issues/927
Mile-Stone Report: https://github.com/fail2ban/fail2ban/milestone/17
Curent State:
Its not Official Supported, but could be added manually