IP Blacklist Cloud is an easy way of blacklisting IPs and Usernames which spamming on your WordPress site. You can easily block selected IPs in just a click, you can manage your blacklist and even you can use export & import feature to add your IP blacklist to any other website you administer.
Install and activate IP Blacklist Cloud plugin. After activation it adds a new menu IP Blacklist on your admin area sidebar. You can easily add any IP (Dashboard -> IP Balcklist -> Add IP to Blacklist)or Username (Dashboard -> IP Balcklist -> Add Username to Blacklist) to your blacklists.
The plugin tells you failed login attempts and Blacklist Statistics etc. Other than this the plugin also shows a IP Blacklist Protected icon and link on comments form, you can disable it from its settings page.
It also submits your website link to the blocked IP database on http://ip-finder.me which enables other users to view how many sites have blocked specific IP address and view their comments.