My application queries mac-addresses of client computers where it runs and stores them on the server. When I analysed the server DB, I found that some mac-addresses repeat 100-150 times. I.e. different client computers in different unrelated organizations have the same macs. So some mac-addresses are very "popular". They also somehow appear in google results. E.g. 58-2C-80-13-92-63. Why does it happen?
Details: my app runs on Windows, client computers belong to different organizations and are situated in different cities. And my app connects to the web-server where it stores some statistics (e.g. mac-addresses).