How to show all banned IP with fail2ban?

Please keep in mind that the fail2ban banning of IP is temporary in nature.

The best way to have a look at the full list of IPs that have been blocked would be to check the log file:

sudo zgrep 'Ban' /var/log/fail2ban.log*

Edit: this answer previously searched for 'Ban:', but even in 2013 the source has no colon (ref).

The following command can also give you a clean list of input rules:

sudo iptables -L INPUT -v -n | less

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