ralxz

Limit the maximum number of IPs a user can log in.
Features: 
* Set the maximum number of IPs and the number of days. 
* See user login logs and whether their login was blocked or not. 
* Reset a specific user’s IP history via the <code>Edit User</code> page. 
* Enable admin or user email notifications when limit exceeded.

Limit Max IPs Per User

Limit the maximum number of IPs a user can log in. Also includes a user login log on the plugin settings page.

WebARTGermany

With this plugin you will have the opportunity to visitors to spamming or inflict damage on your side ruled out. 
These visitors will see only a predefined HTML of your page. These visitors have no way to return your 
Content to see. When we speak of visitors, we are talking about IPs, because a script always needs a reference point at which it 
can hold on, that can be compared to the people who always have to know the other’s face to get him to 
to remember. By and large, that is, when the visitor changes his IP using a proxy server or the like can 
the script does not recognize him and he has access to your content again.

IP Blocker

With this plugin you will have the opportunity to visitors to spamming or inflict damage on your side ruled out.

Limit Max IPs Per User vs IP Blocker