Number of scanned devices changes in every scan

Started by J.S.


Number of scanned devices changes in every scan   07 December 2019, 15:17

Hi there
I am scanning my C class network and don't know why not all devices are shown in the scan. Also, the number of scanned devices changes every time.
Please, let me know how to solve this problem.
SoftPerfect Support forum - Ann avatar image

Re: Number of scanned devices changes in every scan   07 December 2019, 15:29

From your message it is hard to tell what exactly you refer to as "problem", so please pick the relevant information below:
  • No MAC addresses are listed
    This can happen when scanning non-local subnet. See this article for details on scanning non-local subnets and getting MAC addresses.
  • Not all IP addresses are listed
    That would be because not every IP address has network device associated with it. It could also mean some devices are firewalled. Try setting the ping method to Both ICMP and ARP and tick Display inactive devices.
  • A different number of devices is found in each scan
    This can happen over time when some devices go off-line and new devices come on-line. To make sure all devices are detected, use Both ICMP and ARP method, and increase ping timeout and the number of attempts in the scan settings.
Here is a screen shot of the settings mentioned above:
SoftPerfect support forum

Re: Number of scanned devices changes in every scan   28 December 2019, 09:48

@JS, we had this problem and discovered that the anti-virus installed on the workstation was blocking our scans because it thought it was an attack. It was set to block for 5 minutes the first time around then 15 minutes the next time around. It would take about 15 minutes to do a full scan of the networks so each scan would have different results. I don't know if this is your case but I hope it helps in finding the issue. -WS

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