how to let IPTABLE to block 123.123.123.* ?

If i want to block 123.123.123.* in IPTABLE
What shoud i do ?

Is it ? how to let IPTABLE to block 123.123.123.* ? how to let IPTABLE to block 123.123.123.* ?
$IPTABLES -A INPUT -s 123.123.123.* -j DROP
^^^ I can't sure it should work or not ^^^



I have tried ( but not work ) :how to let IPTABLE to block 123.123.123.* ? how to let IPTABLE to block 123.123.123.* ?
$IPTABLES -A INPUT -s 123.123.123.0 -j DROP



It is nice to have your idea . Thank you . !

 

 

 

 

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