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Host ID's on Network not in succession of 'active' or established devices?

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Disclaimer: I am new to networking.

I ran a arp -a command on Terminal to establish what devices are currently active on the network. I was returned a number of devices with Host ID's that were not in succession. For example, I had 1, 18, 19, 24, 40 etc.

I used ping on random host ID's that I cannot see on the arp list, for example 16, 35 and received a request timeout. I'm assuming that these devices are no longer on the network or being used on the network.

My question is: why does the network reserve a particular host ID even though it is no longer active on the network? In theory, shouldn't my arp list just be 1, 2, 3 and so on?

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