Linux: Iptables Find / Check Banned IP Address

How do I find or check IP’s that are currently banned using iptables command in Linux? How do I verify that IP address 1.2.3.4 is banned or not in Linux?

The correct syntax to block an IP address under Linux using iptables is as follows:

/sbin/iptables -A INPUT -s BAN-IP-ADDRESS -j DROP
/sbin/iptables -A INPUT -s BAN-IP-ADDRESS/MASK -j DROP

Open a command-line terminal (select Applications > Accessories > Terminal), or login to remote server using the ssh and then type the following command block an ip address 1.2.3.4 as follows:
# /sbin/iptables -A INPUT -s 65.55.44.100 -j DROP
To view blocked IP address, enter:
# iptables -L INPUT -v -n
OR
# iptables -L INPUT -v -n | less

Task: Check Banned IP’s Linux

Use the grep command as follows to verify that an IP address 1.2.3.4 is blocked or not:
# iptables -L INPUT -v -n | grep "1.2.3.4"

How Do I Delete or Unblock IP Address 1.2.3.4?

Use the following syntax to delete or unblock an IP address under Linux, enter:
# iptables -D INPUT -s 1.2.3.4 -j DROP
Finally, make sure you save the firewall:
# service iptables save

Posted by: SXI ADMIN

The author is the creator of SXI LLC and a seasoned sysadmin, DevOps engineer, and a trainer for the Linux operating system/Unix shell scripting. Get the latest tutorials on SysAdmin, Linux/Unix and open source topics via RSS/XML feed or weekly email newsletter.

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