This happens to be the address you are asking about.  240.0.0.0/5
translates to 240.0.0.0 mask 248.0.0.0 in classical notation.  Caveat
here, this is a class E address, marked as reserved for future use.
I don't know if it's routable, it depends on how the vendor of your
network equipments decides to implement this rule. You might see funky
behavior even if you use this only for your private intranet.

-> Sure, all I wanna do is deny all packets from and to that network for preventing 
atacks with ilegal packets.

Thanks for the explain.
Regards.


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