From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mike Wright <xktnniuymlla@mailinator.com>
Subject: Re: can this be written as one rule ?
Date: Sun, 01 Jul 2007 09:42:53 -0700
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To: netfilter <netfilter@lists.netfilter.org>

U. George wrote:
>> $IPTABLES -t nat -A PREROUTING -i $INET_IFACE -s 121.124.176.0/20 -j DROP
>> $IPTABLES -t nat -A PREROUTING -i $INET_IFACE -s 121.124.32.0/20 -j DROP
>> $IPTABLES -t nat -A PREROUTING -i $INET_IFACE -s 121.127.64.0/17 -j DROP
<snip />
>> And so on ?
> 
You could use ipset:
     http://ipset.netfilter.org

Once a set of type nethash has been created and populated its usage is
very simple.   e.g. To test whether a source|destination address is in a
nethash set named BADNETS use:

     iptables -A INPUT -m set --set BADNETS src|dst -j NETHANDLER

Not sure if this extension is in the kernel yet but it's relatively easy
to add by following the instructions at their website.

:m)