nmap showing different results every time

by Simon Ernesto Cardenas Zarate   Last Updated July 26, 2018 19:00 PM

I am running:

nmap -sP 192.168.251.0/24 

to see the hosts in the office network. Every time that I run the command it shows a different result, for instance it sometimes shows

192.168.251.13
192.168.251.15
192.168.251.17

the next second it will show

192.168.251.13
192.168.251.17

the next second it will show

192.168.251.13
192.168.251.15
192.168.251.17

Basically it's intermittently showing ips of the hosts. What is the reason of this? I know the ips are not leaving/entering the network because they are either ip phones, or laptops connected using ethernet cable. I don't know if it's related to this issue, but there are some wall jacks that suddenly stopped to work, so it looks like some some ethernet ports in the office are working, and others are not.



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