Blocking ip's?

My forum software lists the past 15 mins worth of users and their ip's - just click an ip to block that user from the software.

Is there anything similar for apache/redhat that would ban an ip server wide? Sometimes my server is hit and it's always a flood of page requests from the same ip. I wondered if there were any scripts that would present a browser page where an admin could click an ip to ban?

 

 

 

 

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