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this page was recommended to me by stackoverflow therefore I ask my question again here.

I have performed some nmap scans, yet I have found out, that the scan over a larger area provides more results than over a small area. (Multiple testing)

online Devices: 192.168.178.30 (Android smartphone) 192.168.178.31 Windows PC.

nmap-sS 192.168.178.29-31 (scan 3 IPs) Result: 2 devices online (30,31)

nmap-sS 192.168.178.30-32 (scan 3 IPs) Result: 2 devices online (30,31)

nmap-sS 192.168.178.25-40 (scan over> 3 IPs) Result: 1 device online (31)

nmap-sS 192.168.178.28-31 (scan over> 3 IPs) Result: 1 device online (31)

The same result I get with the other scanning methods (-sT, -sU, ...)

Is there any fix for me at a scan over the entire range to get all devices?

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  • could you try with -P0 (ping scan)?
    – lorenzog
    May 30, 2014 at 13:07
  • I have seen this behavior before with nmap regardless of target. Small IP range scans can produce different results and I never knew why.
    – schroeder
    May 30, 2014 at 14:42
  • Do you get improved results when you add -T2? This will slow the scan down; you may be sending too many packets for your connection, especially if it is wireless or certain virtual NAT connections. May 30, 2014 at 15:57
  • Welcome to Information Security. Please do not cross-post. In any event it is not a good fit here, I am migrating to Super User.
    – AviD
    Jul 10, 2014 at 22:35

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