Linux: Iptables Find / Check Banned IP Address

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To find out if an IP address is banned in Linux using iptables, you can use the following command:

iptables -nL --line-numbers | grep <IP address>

This will show you the list of rules in the iptables firewall and highlight the line containing the specified IP address. If the IP address is banned, you should see a rule that blocks incoming traffic from that IP address.

For example:

iptables -nL --line-numbers | grep 192.168.1.100

This will show you the list of iptables rules and highlight the line containing the IP address 192.168.1.100.

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