Allows the administrator to block people with a matching ip address' from posting messages on the forum.
The IP address can be entered in 2 ways:
Complete IP The full IP of the user, ex. 111.11.1.111 would block all user's who's IP is 111.11.1.111
IP Mask You can enter an IP mask that would block a whole range of IP addresses
ex. 22.23.24. IP mask would block all users who's first 3 IP elements are 22.23.24 or more commonly known as 22.23.24.0/24 mask.
ex. 24.*.21.22 IP mask would block all users who's 1st IP element is 24 and the last 2 IP elements are 21.21