sudo fail2ban-client status
jail 一覧が返ってくるのでこれを引数に指定して調べます
sudo fail2ban-client status recidive
結果例
Status for the jail: recidive
|- Filter
| |- Currently failed: 0
| |- Total failed: 0
| `- File list: /var/log/fail2ban.log
`- Actions
|- Currently banned: 6
|- Total banned: 8
`- Banned IP list: aaa.bbb.ccc.ddd