Blocking Site Access by IP address

In my assersion that I would block a visitor that violated the anonymous comment condition that I was placing I have to be able to do this.

This can be achieved via the control panel of your hosting service or you can apply Linux directives in .htaccess.

Using .htaccess to block an IP

Basically a "deny from" line in the root .htaccess file.

Using a rewrite condition and rule

This is also covered in the htaccessbook.com post.