Iptables Unblock / Delete an IP Address Listed in IPtables Tables

To unblock or delete an IP address listed in the iptables tables, follow these steps:

1. Check the iptables rules for the IP address you want to unblock by running the following command:
   sudo iptables -L -n --line-numbers


   This will display a list of all iptables rules, along with their line numbers. Look for the rule that blocks the IP address you want to unblock.

2. Note the line number of the rule that blocks the IP address. For example, if the rule blocking the IP address has a line number of 3, note the number 3.
3. To unblock the IP address, delete the corresponding rule using the following command:
   sudo iptables -D INPUT <line-number>


   Replace <line-number> with the line number of the rule that blocks the IP address. For example, if the rule blocking the IP address has a line number of 3, run the following command:

   sudo iptables -D INPUT 3

4. Verify that the rule has been deleted by running the following command:
   sudo iptables -L -n --line-numbers


   The output should not contain the rule that was blocking the IP address.

That’s it! The IP address you want to unblock has been removed from the iptables tables and should now be able to access your server.