On my router(Virgin Media) I found a device labelled as "unknown" I often see the router not assigning the device name but I do have a clue about which device is.

However this specific device got me curious because in the port forwarding section, a UDP port has been assigned to the IP address of this unknown device

My question is, what steps and methods can I implement to find as much information as possible from this device?

What I did so far is this On Mac, I run a port scanner, which found port 41800 open On the terminal I run

sudo nmap -sS -T4 -A -p- <IP>

The above found port 9295 open The router has assigned UDP port 9308 to this IP address

If I do telnet on 41800,9295, it connects but I can't do anything else I can't do telnet on 9308 but I get success by running

nc -z -v -u <IP> 9308

However, I'm not being able to do anything more than this, not a clue about what kind of device it could be or anything else

What else can I do?

Thank you

  • 1
    How do you think we can know what device is running in your local network?
    – user163495
    Apr 29, 2020 at 18:53
  • 2
    The MAC address OUI may point you to the manufacturer of the device, in case it is something you forgot about. Apr 29, 2020 at 19:31
  • 2
    Go into your router and blacklist the unknown mac address. See what fails. Apr 29, 2020 at 19:41
  • 1
    Also try nmap OS detection: sudo nmap -O -v <IP> Apr 29, 2020 at 19:53
  • Thank you. Well what I'm trying to achieve here is the possibility to get as much information about the target IP, without having to go through the router. @user10216038 usersudo nmap -O -v <IP> that's an interesting command I wasn't aware of, I always wondered how routers get the name of the devices, the above does that Sadly here, it's returning unknown as the router. I searched the MAC online and couldn't find any hit
    – Sgr
    Apr 29, 2020 at 20:46

1 Answer 1


There are many free utilities that will do this. On windows I like wireless network watcher from NIRsoft. On mac, try FING


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