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Unknown Mac Address on Router


deltachange's Avatar
deltachange deltachange is offline
Junior Member with 2 posts.
Join Date: Jan 2012
Location: Colorado
Experience: Intermediate
10-Jan-2012, 03:21 AM #1
Unknown Mac Address on Router
I have an unknown mac address listed in my router's connected devices pane. There is no ip address or device name listed. I know the mac addresses of the machines I have put on the internet, and i don't recognize that one.

Now as much information as I can think of to give:

Router: Netgear N300 WNR2000v2
Firmware: V1.0.0.40_32.0.54NA

Wireless Settings:
enable ssid broadcast
channel 10
up to 54mbps

Wpa passkey TKIP
Passphrase is strong, Upper case and lower case, spaces, and numbers. No special characters due to family not being tech savvy/wanting to remember complicated password. Not easily guessable information. Etc etc.

Network setup is:

ISP antenna to router, router wireless to:
Imac, mac mini, xbox 360, three smart phones, two ipod touches, wii
wired: none

in netgear user interface, list of connected devices:
mac address: 78:d6:F0:7E:35:C5
IP: --
Device Name: --

I tried to figure out what kind of device it was, but using three different searches of mac addresses from a google search, no identifiable manufacturer has been found.

Also in list of devices with wireless cards on the router, the same mac is listed along with another one I wasn't aware of:

Device name: UNKNOWN
mac address: 00:1a:73:31:eb:dc

I first started looking into this problem because I was experiencing random speed slow downs and increased latency with unknown causes. I changed my security to WPA (should have a long time ago, but family was hesitant to switch all their devices to new settings.) and now I have found those mac addresses on the two lists afterwards. I know the mac addresses of everything I put on the network and those don't match any of them. Mac address lookup of last device shows Gemtek- a taiwan company of wireless networking/broadband products.

Any help you can provide would be greatly appreciated.

Edit: By help I mean identifying what they are or blocking them if they aren't supposed to be there.


Last edited by deltachange; 10-Jan-2012 at 09:16 AM..
TerryNet's Avatar
Computer Specs
Moderator with 69,214 posts.
Join Date: Mar 2005
Location: Ottawa, IL
10-Jan-2012, 12:50 PM #2
Do they come back after you restart or power cycle the router?
deltachange's Avatar
deltachange deltachange is offline
Junior Member with 2 posts.
Join Date: Jan 2012
Location: Colorado
Experience: Intermediate
10-Jan-2012, 01:13 PM #3
Yes they do. and since the router doesn't support black listing mac addresses I would prefer not to turn MAC address control on and have to add a mac address everytime we had a guest. I'm not sure if they even have access to the router as no ip is given. But they may just be passing the dhcp client.

Thank you for your time
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