Have you tried to block the range of IP addresses via an .htaccess file? 

To block multiple IP addresses, list them one per line.


    order allow,deny
    deny from 177.0.0.1 
    deny from 177.0.0.2
    deny from 177.0.0.3
    allow from all

You can also block an entire IP block/range.

e.g. – `deny from 177.0.0`

This will refuse access for any user with an address in the 177.0.0.0 to 177.0.0.255 range.