How Do I Block an IP Address on Centos 6 via IPTables

Open a new Terminal Window
Type the following command replacing IPADDRESSTOBLOCK with the IP Address that you wish to block.
```
iptables -A INPUT -s IPADDRESSTOBLOCK -j DROP
```
Explanation of above command:
-A = Append one or more rules to the end of the selected chain -s = Source, in this case the IP address to block -j = This indicates what to do if the rule matches
Save the Rule to the IPTables
```
service iptables save
```