This page consists of screenshots from the Manage IP Ranges Screen in Clean Up Booster WordPress Plugin.
This gives an idea about how to Block/Unblock IP and view the comments related to it.
You can easily block IP Range by providing Starting and Ending IP. You can also choose Time Duration to block the IPs for specific time period or to permanently block it from the site.
Using this plugin, you can view list of Blocked IP Ranges and there details if needed delete them from the list.
If any problem occurs during any process, please contact us at firstname.lastname@example.org