Capturing a C Class range dynamically into an ipset table within iptables. Possible?‏

[José Pablo Pérez <josepablo@xxxxxxxxxxxx>]

Currently with ipset iam able to send to a table the inidivual (/32)  
source IP of a connection...

I need a way to send to iptables the C Class to an ipset .

In other words I need the historical list of last 30 min of C class  
ranges that have requested my server.

I need this preferably done without something outside of iptables  
(such as a daemon).

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