I am getting a lot of spam comment on my blogs, so there any plugin or any solution to block a specific IP / IP's due to Spam comments.
I use WP-Ban and although it hasn't been updated in a while it still works. I use it for blocking an IP range and it works well.
You can also use your .htaccess file like so: RewriteEngine on <Files *> order allow,deny deny from 209.85.135.104 allow from all </Files> Code (markup): Obviously you don't want to block the IP I've given since it's Google but it gives you the idea.