how to find unknown ip address?

[hadi motamedi <motamedi24@xxxxxxxxx>]

Dear All
On my network, there is a node with unknown ip address so I do not
know about its range and it can be any of the range xx.xx.xx.xx . Is
there any tool on my centos server to find this unknown ip address
(irrespective of the range of my centos server self ip range) ?
Thank you
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