![]() In DNS this is achieved through PTR records. ![]() Once you have the IP address, you are relying on a name resolution service to do a reverse lookup and return a hostname that is associated with an IP. You can trigger arp requests manually by pinging every IP on the network, or using a utility like nmap to do them all in one go. In order for this to work, both devices must be on the same layer 2 network - the same switch/vlan. In order to populate that list, the machine will have had to at some point issued an arp request, saying "who has IP x.x.x.x" - the owner will reply and upon receipt, the arp table will be populated. As per the question, arp -a will list the MAC addresses and corresponding IP addresses. This means that you need access to a device that has the IP address associated with the MAC. If you start with a MAC address, you first need to get the IP address.
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