Forum Moderators: open
Guess it's time to add another one to the list:
RewriteCond %{HTTP_USER_AGENT} ^HELLO$ [OR]
First have a look if it's really downloading a file, meaning the file-size it's taking.
"Hello" can also be a small search- engine or directory that is just checcking if the link to you that they have in their directory is still up and valid.
and "Hello" can also be, a part of a reciprocal link program, if you have added your link somewhere, that checks if you are linking back to them.
As I think it is not possible for the same Bot/Spider to come from all the different IP's you have listed.
Greetings,