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For a validation process I need to know the MAC address of a cable modem. (I do not need to know the MAC address of the network adapter.) The cable modem though is placed somewhere hardly accessible, so I want to avoid physically touching it to read its sticker.
What I do have is a Windows 7 machine connected to it, so I want to look up its MAC address via power shell. How do I achieve that?
k0pernikus
Posted 2013-09-10T13:57:29.453
Reputation: 1 140
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If the modem has an assigned IP address, you can find the MAC address using the ping and arp command:
ping 1.2.3.4 arp -aThe MAC address information is pulled by the ping command, and the info is temporarily stored in your NIC. The arp command is to show the stored information.
Callen L
Posted 2013-09-10T13:57:29.453
Reputation: 1 781
arp doesn't list the modem for me, though thankfully the ip listed in another answer does (192.168.100.1). Would it be missing because I have a router sitting between my computer and the modem? – matt wilkie – 2015-08-28T02:09:21.470
1+1 for a nice generic always working answer. The ARP table is not in the NIC though, but in OS memory. – Hennes – 2013-09-11T00:33:32.520
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Assuming you want the WAN MAC address. Many cable modems have a configuration or status page. For Comcast modems, it is typically 192.168.100.1. If your modem is also your router, it will be your LAN gateway address. Here's what I get when I open 192.168.100.1 on my cable modem:
Sorry, I don't know how to do this with powershell.
rblake
Posted 2013-09-10T13:57:29.453
Reputation: 81
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If the modem has a local address in the LAN you're connected to and you know it, then you could use the arp command to see its physical address.
arp -a lists all discovered addresses.
For more usage of the arp command, you can type arp /? in shell.
Moses
Posted 2013-09-10T13:57:29.453
Reputation: 10 813
Why don't you just look at the label on the modem and/or log into the configuration page that contains this information? – Ramhound – 2013-09-10T14:00:02.650
@Ramhound I stated why I do not want to read its sticker. As to the configuration page: I did not know that the device had one. – k0pernikus – 2013-09-10T14:06:06.023
@Ramhound It would be nice to know if there is a generic way to get to the MAC address of any modem. – k0pernikus – 2013-09-10T14:06:43.633
Are you looking for the WAN MAC or the internal LAN MAC? – PsychoData – 2013-09-10T18:47:15.980
See the answer from @rblake. It worked great for me. I have a Router (Belkin), and a
– Kevin Fegan – 2013-09-11T03:17:42.250ARRIS DOCSIS 3.0 / PacketCable 1.5 Touchstone Telephony Modem, Model: TM722Gfrom Comcast. On the first tab on that page ("Status"), under "Interface Parameters", it shows the "LAN MAC" and the "CABLE MAC" addresses.