Device Tracker: Where is it coming from?

I happened to check under entities and noticed that there are entries for MAC address of every network device that I have in the home network. The integration column is showing that these entries are being provided by Device Tracker. I do not have any integration which is providing all these entities. I have not added any integration for router or firewall. Question is: where are these entities coming from? They are not stale entities. They are all showing a status of Away.

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