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I am not sure what the question is here. So I might have interpreted it not as you might have expected.

But wireshark can't answer all questions. In this case it points you to a spot where you need to dig into the issue to get additional information.

If you know who is sending APR requests for IP addresses you don't know then it is time to go to that system and see what is going on over there. That answer is not in the network but in the specific host.

Happy hunting.