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Double check your Allows
I think ^$ might be better
Doesn't the IP pre-empt anyway? In mine the block would be on the IP and the UA checked only if the IP were not blocked.
I think ^$ might be better?
I've some IP's blocked with "deny from" and some IP's blocked with mod_rewrite (despite being aware of the caution of mixing methods, I'm not aware of the order in which the rules are processed).
I've a mere two allows in place
Is your overall site Deny,Allow as opposed to Allow,Deny? Or did you just mean that you have FilesMatch envelopes for certain files?
Why not just block the IP? They must be fairly offensive, because I've got all three blocked already.
and in addition the IP's ranges are denied
In htaccess, a double negative does not make a positive. (403 + 403 != 200) I know you know that.