Use the Command Prompt. 1) Type “cmd” in the Windows Search Box and open the Command.

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Learning has never been so easy!

It is usually not possible for a person to get the MAC address of a computer from its IP address alone. These two addresses originate from different sources. Simply stated, a computer's own hardware configuration determines its MAC address while the configuration of the network it is connected to determines its IP address.
On Windows 10, you can find this information more quickly than you could on previous.
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How to find an IP address when you have the MAC address of the device.

4 Steps total

Step 1: Open the command prompt

Click the Windows 'Start' button and select 'Run.' In the textbox, type 'cmd' and click the 'Ok' button. This opens a DOS prompt.

Step 2: Familiarize yourself with arp

Type 'arp' in the command prompt. This gives you a list of options to use with the arp command.

Step 3: List all MAC addresses

Type 'arp -a' in the command prompt. This lists a number of MAC addresses with the associated IP addresses. Since you have the MAC address, scroll down the list to find the associated IP address. The MAC address is shown in the 'Physical Address' column with the IP address in the 'Internet Address' column. An example of a table record is in Step 4.

Step 4: Evaluate results

The following is an example of ARP output. The first column is the IP address. The second column is the MAC address, and the third is the type of IP assigned--static or dynamic.

Internet address Physical Address Type

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192.168.0.1 01-a3-56-b5-ff-22 static

Published: Jan 21, 2013 · Last Updated: Aug 03, 2017

References

How to Use a MAC Address to Find an IP Address

16 Comments

Datil
Krizz Jan 21, 2013 at 10:36pm
You've forgotten about one little thing: arp keeps mac<>ip association of recently contacted peers, so it's quite often not to find the mac<>ip association we're looking for, of machine that exists in the network. Prior to using arp -a it's wise to ping the host first.
Habanero
Twon of An Jan 21, 2013 at 11:24pm
Used in conjunction with ping (thanks Krizz), this is a good basic walk through. I can't go wrong with these steps!
Cayenne
Syldra Jan 22, 2013 at 03:17pm
I'm sorry but... if the thing is to find the IP address from the MAC, how will you ping the host first ?
Serrano
Enzeder Jan 22, 2013 at 04:37pm
I thought the aim of this exercise was to FIND an IP address. Doesn't using PING imply you already know the IP (or hostname) which makes ARP redundant? How do you PING a MAC?
Assuming no IP or hostname info, I have used a portscanner (like LanSpy or Zenmap) to get MAC > IP info. Currently my preferred method if the device isn't listed in Spiceworks :-)
There was a time when I was a baby admin and I didn't want to raise alarms by installing a scanner that I wrote a batch file (yes, that long ago) that PINGed every IP on a subnet, then immediately ran ARP redirecting output to a text file. But that depends on the device in question being set to respond to PING requests.
Pimiento
christian.mcghee Dec 23, 2013 at 03:47am
This does not work for any host on the other side of a router. Any hosts on the other side of the router will show the routers MAC address.
Serrano
@Greg Mar 11, 2014 at 03:11pm
I realize this is an old topic, but someone like myself may be looking for an answer. I became admin of a network with little over 200 devices, which none of the cabling was mapped. I was told I was responsible for the cabling, so I began looking for a way other than toning out all the cables. I was fortunate to have Cisco switches and Windows Server 2008. I was able to use the Cisco Network Assistant to grab MAC addresses and the port number, then in DHCP on the Server 2008 I could find the MAC and corresponding IP. Furthermore I could also get the computer name from DHCP and correlate that to which user was on the machine using PDQ inventory to see who was logged in to the machine. Most of this of course depends on the devices being in use. I've been able to create an accurate map of about 90% of my network without touching the cables.
Pimiento
christopherblouch Jun 4, 2014 at 05:08pm
I am interested in this thread, hopefully someone can help. There are 4 types of arp message: arp request, arp reply, rarp request, rarp reply. So, that being said, is it possible to manually send a rarp request? Sort of a arp based ping?There is arping, but we need rarping... if it exists. Of course, I understand that I can't arp outside my default gateway, but if there is a rarp request, how is it used inside the local network? Thanks to whatever guru can explain what we're missing.
Serrano
Maxwell Brotherwood Jul 18, 2014 at 10:07am
Great for finding an IP if you have the MAC address.
My instance where I found this useful was after updating the firmware on a switch remotely via TFTP, the IP of the switch would change (making pinging redundant, obviously). Trying a network scan over Spiceworks or rescanning the single device would not update the IP and I needed an alternate way to find it.
This method worked perfectly. Thank you. Hopefully this helps those trying to understand the purpose of this practice and how it was in-fact useful.
Pimiento
robertrobinson2 Aug 4, 2014 at 04:30pm
I understand the issues in attempting to use a MAC address to locate a device from outside of its local network.
What puzzles me is how Honeywell Total Connect does this with their WiFi connected thermostats. The hardware configuration is: a Honeywell WiFi thermostat that is WiFi connected to a Netgear N600 router which uses DHCP to assign an IP adddress. The router is connected to Comcast with a Motorola SB6120 modem. Comcast assigns a system wide (dynamic) IP. There is no static IP.
On initial setup, a WiFi connection is first established between the thermostat and the router. The thermostat's MAC and CRC and a username and password are entered into the Total Connect software setup. It is then possible to read or set thermostat values using Total Connect Web pages.
I know how to do this with a static IP or a DNS service that automatically tracks changes in dynamic IP addresses.
Does anyone understand how this works with Total Connect?
Tabasco
Joe979 Sep 4, 2014 at 01:05pm
This post was extremely helpful, thanks itdownsouth :) I used show interface to find MAC addresses on our switches (reason for this is poor network documentation and mis-labeled switchports and wall jacks...). I took the MAC addresses that I could not locate the hosts or ip addresses for, ran arp -a to list the address<>mac list, then one by one, nbtstat -A for each IP address I matched a MAC to from the unlabeled ports. Tedious, but found 5 or 6 now (seeing hexadecimal thoughts no

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