Mozilla Compatible Agents?

Good or Bad

[ICPWeb]

How do I determine good Mozilla Agents from bad ones?

I'm seeing a lot entires in my site logs for:

Mozilla/3.01 (compatible;)
Mozilla/4.0

There's no-other info, or identification associated with them.

If these are bad agents what is the proper syntax to add RewriteCond for them in my htaccess file?

Is this correct?
RewriteCond %{HTTP_USER_AGENT} ^Mozilla/3.01 \ (compatible) [OR]
RewriteCond %{HTTP_USER_AGENT} ^Mozilla/4.0 [OR]

Any insights would be appreciated.

Thank you in advance.

[Dreamquick]

Those UAs are often associated with proxies, you can see them attached to other things but generally speaking when people want to mask an application as a browser they tend to use a more complex and modern UA because it looks less conspicuous.

- Tony