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Comment by abbeyj | Hacker News Reader

How would you use ARP here? ARP lets you find a MAC address assuming that you already know the IP address that you want to talk to. But without static IPs you wouldn't know the IP address of the phone that you're interested in. I'm not seeing how ARP will help here.

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you don't need to know the IP address , you can just dump the ARP cache and look for the MAC address you need.

on Linux:

  $ arp -n | grep "MAC_ADDRESS_HERE"
  192.168.86.23            ether   MAC_ADDRESS_HERE   C   wlp4s0

if it's in the ARP cache it's "home" (or rather was, within the last 60 seconds, or gc_stale_time)

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