How can I find a MAC address if arp -a  says no ARP entries ???

Posted on 2004-11-05
Last Modified: 2010-03-18
I am trying to do reservations and I need MAC addresses of certain IPs but arp -a doesn't work

Pls advise
Question by:dorgunr
    LVL 11

    Assisted Solution

    Hello dorgunr,

    Have you tried doing a "ipconfig /all" on a command prompt. This is when you are physically sitting on that machine. You can also look at these free utilities that would tell you that remotely for the whole network:

    LVL 11

    Expert Comment

    Also, I saw you said that arp -a is not working. Prior to doing this, did you actually try pinging ? Can you first ping the machine with its ip, and then do arp -a thatipaddress
    LVL 11

    Expert Comment

    LVL 20

    Accepted Solution

    The address resolution protocol (ARP) cache is a list of recently resolved IP address to Media Access Control (MAC) address mappings. The MAC address is the unique physical address embedded in each network adapter.

    If an entry in the ARP cache is incorrect, IP datagrams may be sent to the wrong computer. To display all mappings currently in the ARP cache, use the ARP command by typing arp -a at a command prompt. You should receive either a "No ARP Entries Found" message (if the ARP cache is empty) or a response similar to the following:

       Interface: on Interface 2
       Internet Address      Physical Address      Type              08-00-02-06-ed-20     dynamic            08-00-02-0a-a3-10     dynamic

    To remove any incorrect entries in the ARP cache, clear all entries using the following command:
    arp -d <IP address>
    Where <IP address> is an Internet address stored in the ARP cache. Use this command for each entry in the ARP cache until all entries have been deleted.

    For more information on the syntax, options, and usage of the ARP command, type arp -? at a command prompt.
    LVL 18

    Expert Comment

    Use netscan, is free from

    If will show you quickly all the mac addresses in a network.
    LVL 4

    Expert Comment

    or try invoking on the command prompt nbtstat -A theipaddress

    Author Comment

    Thanks !!!

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