How to View the blocked Ip’s for Rules in IPtables arising from Fail2Ban#

Find the policy / chain you want to test

sudo iptables -L

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
f2b-NoAuthFailures  tcp  --  anywhere             anywhere             multiport dports http,https

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain f2b-NoAuthFailures (1 references)
target     prot opt source               destination         
REJECT     all  --  dedic1351.hidehost.net  anywhere             reject-with icmp-port-unreachable
RETURN     all  --  anywhere             anywhere

Then test it

sudo iptables -L <policy_name> -v -n

eg.

sudo iptables -L f2b-NoAuthFailures -v -n

here:

Chain f2b-NoAuthFailures (1 references)
pkts bytes target     prot opt in     out     source               destination         
20  4114 REJECT     all  --  *      *       151.80.47.82         0.0.0.0/0            reject-with icmp-port-unreachable
    6   352 REJECT     all  --  *      *       178.159.37.139       0.0.0.0/0            reject-with icmp-port-unreachable
2809  564K RETURN     all  --  *      *       0.0.0.0/0            0.0.0.0/0

Source#