Administrators can ban IP addresses used by users who abuse the forum functions or violate the forum rules and policies. All banned IPs cannot be used to add posts to all forums in the Forum application. Any users who use banned IPs to add post, will be recognized as the banned user. As the result, the banned user can only view in Forum.
Click 
on the Forum Administration bar then click Banned IPs from the drop-down menu. The Banned IPs form appears.
To ban an IP, simply enter the IP address into the IP textboxes and click [Add]. All banned IPs will be listed in the banned IPs table. You can view all posts which are posted from the specific banned IP or delete them from the banned IPs list.
To view all posts submitted from a specific IPs, click the [Posts] link of the respective IP. These posts can be viewed and deleted by the administrator.
To remove banned IPs from the banned IP list, click the [x] icon of the respective IP.
Besides, you can also filter the banned IPs if there are so many banned IPs.
To filter banned IPs, enter a part of the IPs address into filter textbox, all IPs matching with filter term will be displayed.