I use fail2ban to stop annoying things like ssh bruteforcers, etc.

Sometimes I accidentally manage to get my own address added, or need to unblock a specifc address. Here's how:

user> sudo fail2ban-client status sshd
Status for the jail: sshd
|- Filter
| |- Currently failed: 0
| |- Total failed: 3
| `- File list: /var/log/auth.log
`- Actions
|- Currently banned: 1
|- Total banned: 1
`- Banned IP list:

And then to remove the IP:

user> sudo fail2ban-client set sshd unbanip