IP Blocks provides a list of all IP addresses that are blocked from using the website. From this form, additional IPs can be blocked as well. Select the "unblock" link next to any IP addresses you wish to remove a block on.
Blocks are used to keep system abuses at bay. As a site manager you may find that some visitors will have malicious intent, placing fictitious orders, posting inappropriate information to forms and more. These individuals can be blocked from Form Submissions management, Forums management and Sessions. All blocked individuals will be listed in IP blocks along with the reason they where blocked (assuming the blocking party entered a reason).