Your machine ID is your Ethernet ID/MAC address: 6 pairs of numbers and letters A-F. You may see the pairs un-separated (d312a930bc7f), separated by colons (d3:12:a9:30:bc:7f) or separated by dashes (d3-12-a9-30-bc-7f).

• On Windows, go to: the Start menu, then in the search box type "cmd" and hit Enter.
  • In the cmd window, type "ipconfig /all". 
  • Find the line that reads "Physical Address".
• On Mac, go to: System Preferences > Network and select your active network interface (e.g., Ethernet) from the list on the left. Click on 'Advanced...', then on 'Hardware'.
  • The machine ID is listed under "MAC Address".