Hello - I have a really strange problem. Recently - an unknown bulb has been popping up every time I got to pair a zigbee device. It claims to be a Hue bulb (see signature below). I have never used Hue bulbs and every time I initiate a zigbee pairing process, this bulb pairs instantly. If I delete it and try and pair a valid device, it shows up again. The only way I can add a legitimate device is by pairing this "ghost" device. Currently, I have left it paired to my hub with the driver set to "device" (that's what it defaults to). Does anyone know what could be happening? And how I can get rid of this thing?
Google says it's a Philips Hue bulb.
Do you have them and did one just drop off and you didn't notice?
This is what the Zigbee map shows (and now there is an "unknown" as well 
). I recently changed zigbee channels (this mysterious device problem was already happening before I changed channels). It is consistently been showing as a "repeater" and connected to the Kitchen Zigbee Repeater (IKEA Repeater) and/or the Glow Light Plug (Samsung Zigbee Plug)
Maybe keep turning it on and off.
Then when you chat to your neighbour they might mention that they think they have a ghost turning a light on and off. 
Seriously though. Could it be that a neighbour is using one but does not have a smart hub?
Was about to suggest the same. How long can Zigbee devices remain in pairing mode after being reset?
The purple Unknowns are just an artefact of the ZB mesh, most likely when you changed channels.
They take forever to expire but they do eventually go away.
I was wondering the same thing. I think this first showed up mid-July!!
I checked with one of my neighbors and they definitely don’t have a Hue bulb or a hub. Will check with the neighbor on the other side. Do you know what the range of these devices are? I hope it’s not as far as across the street or end of the block 
That seems unlikely. The limit is about 30 to 50 feet at best, since there is at least your exterior wall involved. If it was a neighbor's house, that adds another exterior wall, and an unknown number of internal walls. I've found some devices will need even less range to be able to pair.
Is there a chance you have a smart bulb in a lamp, but you don't know that it is actually a smart bulb? Have tried giving it the proper driver and see if any of what you assume are dumb bulbs respond?
Nope - I've never had Hue bulbs and haven't added anything recently. I discovered this problem when a couple of my Sengled bulbs started acting flaky (turned out that removing on the the IKEA repeaters that they were routing through fixed that issue) but during that process I had to reset and re-pair one of the bulbs. That's when this mysterious thing started showing up and wouldn't let the Sengled bulb pair. Once I "allowed" this to pair (driver = device) the Sengled bulb paired right away
Weird. Is it some other device that may just be showing as a Hue bulb? Did you add any appliances or anything that may have a Zigbee radio in them you didn't realize?
That also seems unlikely, but I have no other ideas. Hue bulbs should act as repeaters, so it might be interesting to wait and see if something tries to find a route though it. If it starts acting as a repeater, it gives you an idea of where it is based on what devices find it as the best route.
In the Zigbee Map app, it does show as a repeater (blue) so I can only hope that nothing tries to route through it
.
One thought is that I try and pair it to my C7 which is sitting around (or an old C5 that is in a junk drawer) , and then turn the hub off. Can’t do that with the C7 as I use it occasionally.
On the other hand, it’s sitting disabled on my C8 with a “device” driver so hopefully it won’t try and mess with the mesh…
I believe disabling the device only tells Hubitat to ignore it, but the Zigbee mesh doesn't know you disabled it in Hubitat, and it will still act as a repeater if something decides to route through it.
It may be that nothing sees that device as a good route, especially if it is in another house, so probably nothing will try to use it anyway. Hard to say.
I experienced a troubling zigbee episode and wrote a document - maybe you'll find something useful in it?
https://community.hubitat.com/t/re-my-zigbee-hell-the-remix/164268/2?u=jshimota
The doc is here:
Thanks! That looks to be quite useful 
Set it as a bulb, write a rule to make it flash, then wait in the middle of the night to trigger it and watch if one of your neighbours start panicking.
Well, I just spent the weekend trying to rebuild my zigbee network after completely nuking it. Only now am I finding your document that says right out of the gate "It is STRONGLY advised to NEVER run this." Oh well. I feel like I've found a treasure map and I'm following it to zigbee gold. Just got the Hub Diagnostics experimental app installed and running. Thanks for the document! I'll update with my results.
Update: For the first time in ages, ZigBee map finds all my devices and shows no unknowns! I waited a few days to make sure this was a stable condition. Just sorting my devices in Excel made me realize that I really only had a few types of devices (just a bunch of them), and I didn't both trying to figure out if the outliers were ZigBee 3.0 or not. I just replaced them figuring the same types of devices were more likely to talk nicely to each other. The other big help was the tip to swap a device with a virtual device one, removing the device, powering down the device, and re-adding the device. This was the biggest help in clearing the cached routing tables and getting rid of old ZigBee addresses. Anyway, thanks again.