X with a mask of You will now get a list of all the connected devices on your network along with their physical addresses! Pretty nifty trick. Before you can use it, however, you need to scan all the IP addresses in your subnet in order for it to work. The program itself has a auto scan feature that takes in a IP range. You can also use a free program called Advanced IP Scanner, which will do the same thing and is a program totally dedicated to scanning IP addresses:. Founder of The Back Room Tech and managing editor.
He began blogging in and quit his job in to blog full-time. He has over 15 years of industry experience in IT and holds several technical certifications. Read Aseem's Full Bio. An example of a table record is in Step 4. The following is an example of ARP output. The first column is the IP address. Prior to using arp -a it's wise to ping the host first.
What is a MAC address?
Used in conjunction with ping thanks Krizz , this is a good basic walk through. I can't go wrong with these steps! I'm sorry but 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. 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. 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 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 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 am interested in this thread, hopefully someone can help.
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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?
Consult the Manual
Sort of a arp based ping? There is arping, but we need rarping 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. 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.
I understand the issues in attempting to use a MAC address to locate a device from outside of its local network. The router is connected to Comcast with a Motorola SB 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.
It is then possible to read or set thermostat values using Total Connect Web pages. Does anyone understand how this works with Total Connect? 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 Tedious, but found 5 or 6 now seeing hexadecimal thoughts now though By the way, the reason this is working great for me is the lack of routers -- all switches, so if you have only one subnet like we do, this will do -- otherwise, you will probably need to login to the router or switch on the other side of the router to find MAC address tables on the other networks.
You may not be able to see them all on the local host, as far as arp -a on the local host, but looking up the arp or hosts tables on switches and routers could be a possible solution for those with multiple subnets. Use SuperScan to do a bulk ping of the entire network range.
How to find mac address of a computer, router, network card and other equipment
SuperScan 3 I recommend is a free tool by McAfee. It should be able to find most devices on the network. You can specify the range to scan and scan across subnets. I won't try to share all the features because quite frankly I don't know them all.
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I can tell you exactly how I designed it. It's actually quite simple.