Joost

Comment Ban Manager was created out of a need to manage bans. Sometimes, when the discussion becomes ugly, you want to temporarily ban people rather than permanently, in order to let them cool down. Or you want to implement a “three strikes you’re out” policy. When you have a lot of comments and heated discussions, managing this manually can take a substantial amount of your precious time. Comment Ban Manager keeps track of all this for you, so you can focus on more rewarding activities.
As an additional feature, you can also ban comments from the Tor network. In our experience, it was used a lot by banned people to circumvent our bans.
Features:
<ul>
<li>Ban IP-based, user based or both</li>
<li>Wildcards in IP addresses allowed (xxx.yyy.. and xxx.yyy.zzz.*)</li>
<li>Define your own ban “packages”, eg. a two week ban, or a three month ban</li>
<li>Assign these packages to your bans</li>
<li>Block comments originating from the Tor network</li>
<li>Allow or disallow Tor comments when a user is logged in (default is allow)</li>
<li>Automatically unban users</li>
<li>Automatically remove bans 1 year after expiration (configurable, GDPR-measure)</li>
</ul>

Comment Ban Manager

Comment Ban Manager enables you to block ips and users from posting comments to your site

MarkTroll is a simple WordPress plugin that implements user <a href="http://en.wikipedia.org/wiki/Hellbanning" rel="nofollow ugc">shadowbanning</a> (or hellbanning) for comments.
Comments by shadowbanned users will be invisible to all other users. However, the shadowbanned users will continue to see their own comments, hopefully oblivious to the fact that they’ve been shadowbanned. This is non-destructive in that changes are not made to the comments themselves. Shadowbanned comments are still saved to the database and visible to admins in the dashboard comments listing. Note that contrary to other plugins, Marktroll does not expect the commenting user to be logged to be shadowbanned.
If you disable this plugin, showbanned comments will become visible to all users.
Licensing
All code is released under The GNU License. Please see LICENSE.txt.

MarkTroll

MarkTroll is a WordPress plugin that will let you shadowban (hellban) any unlogged (regular) commenter on your blog.

Comment Ban Manager vs MarkTroll