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I have a managed switch on my network but I don't remember the subnet.

How can I scan all the private network without changing my ip address : 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16

Thanks for advices

closed as off-topic by Rory Alsop Mar 27 '14 at 0:03

  • This question does not appear to be about Information security within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

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    This question appears to be off-topic because it is not a security question - the nmap manual will give you the answer – Rory Alsop Mar 27 '14 at 0:03
  • Or, read this question: security.stackexchange.com/q/10678/485 – Rory Alsop Mar 27 '14 at 0:04
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    IMHO it's a security question because some devices can be connected to the network and on another ip range. This can have a security impact. – hotips Mar 27 '14 at 9:22
  • that does not make it a security question. – Rory Alsop Mar 27 '14 at 10:14
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It seems like you are really looking for the tool netdiscover.

Netdiscover works by sending and listening for ARP packets. (active and passive mode). Since it is ARP, its limitation is that it only work on the same LAN (layer 2) - you cannot traverse gateway's.

You do not have to change the ip address on your interface with this tool.

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