I run a web server and an ftp server on my linux box.  On the web server 
I also have one of those html to email forms so users can email me 
without having to know my email address.  Lately a troll has started 
using that form to make a pest of himself.  I want to block him from 
having access to my web and ftp servers.  Yesterday I blocked the 
address he's been using for several days.  Today he got back in.  I 
looked and discovered that his ISP apparently assigns its users dynamic 
IP addresses.

I did a lookup on the two IP addresses he's used so far.  They appear to 
be from two different subnets.  I would like to block those subnets 
without blocking anything else.

For example: I know in httpd.conf if I put in
RewriteCond %{REMOTE_ADDR} 192\.168\..*
it will block any IP address that begins with 192.168

Can someone please tell me what in the above example I need to enter to 
block the subnets the troll is using?  Below is information I found at 
www.ripe.net/whois

For 83.146.27.162

inetnum:      83.146.26.0  - 83.146.27.255
route:        83.146.0.0/18

For 84.9.75.12

inetnum:      84.9.64.0  - 84.9.95.255
route:        84.9.0.0/16

Thank you

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