In the TMobile Home Internet app, under "Devices", I recognize all of my devices EXCEPT one - the list includes a mystery device with its IP address and its MAC address.This mystery device is currently shown as being offline.I changed my network password during initial setup (two days ago), and I believe my network is secure.Does TMobile connect something to my network? Does the app assign new IP and MAC addresses each time a device connects to the network, and maybe the app is displaying information from when a device was previously connected by me? Is there any easy way for me to determine what this mystery device is?Thanks.

You made me look closer: If you've had any device connected even once, it's added to that list. I have the MAC of my PC that I had connected only once via ethernet in the list.It's apparently a historical list, not a current list.

I assume you've gotten the MAC IDs off each of your devices and compared? Maybe there's a device you hadn't considered like a smartwatch or somesuch?MAC IDs are inherent to the device and cannot be changed. They can be spoofed, but I highly doubt T-Mobile would have a need to do that.The router could assign a new IP when you connect, I haven't paid much mind to that as it usually doesn't matter.

The MAC address for the mystery device does not match the MAC for any of my devices.I looked up the MAC for the mystery device online, and learned that this oneis a randomized number, not the useful/true MAC of a device.I also read that MAC randomization is the default setting for iOS 14 (which I am using). So, maybe my own iOS 14 device generated this randomized MAC and the TMobile HI app is keeping it listed as an offline device (instead of purging it from the device list).If the TMobile HI app continues to display all MACs that have ever connected to my network, then I guess the list will grow and grow if my iOS 14 device generates a new random MAC every time it connects. Time will tell.Does this make sense?

Was about to post another reply about this. Yes that's very likely what it is.Randomized MACs are intended to make it harder to track your device as it connects to various WiFi networks.I'm a software guy by trade, and my concern is exactly that purging. There doesn't seem to be a way of doing manually. One hopes that there's some timestamping and autodeletion of those dead MAC IDs.Can probably do an experiment of reducing the device limit to something below your current list length and see what the gateway does with it.

Forum Discussion

Wounded_Knee

Network Novice

Hace 4 años

Home Internet - I do not recognize a device on my network

In the TMobile Home Internet app, under “Devices”, I recognize all of my devices EXCEPT one — the list includes a mystery device with its IP address and its MAC address.

This mystery device is currently shown as being offline.

I changed my network password during initial setup (two days ago), and I believe my network is secure.

Does TMobile connect something to my network?
Does the app assign new IP and MAC addresses each time a device connects to the network, and maybe the app is displaying information from when a device was previously connected by me?
Is there any easy way for me to determine what this mystery device is?

Gracias.

Nana_Jean
Newbie Caller
Hace 2 años
I also show a Nintendo switch which I do not own. My iPhone is listed 2 times. Just wonder if these devices are being used ?

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Home Internet - I do not recognize a device on my network

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