Host ID can be added to your list through the User Base object.
  1. Navigate to any module 
  2. Analysis > Manage Lists.
  3. Select Manage Basic and Advanced Lists 
  4. Add a new Advanced List, or edit an existing List.
  5. Select the Select Objects tab.
  6. If not already added, select User Base (under Constituent Information).
  7. Select the Display Fields tab.
  8. Select the Select Fields... link.
  9. Expand User Base.
  10. Select the box to the left of Host ID.
  11. Click Select in the upper right corner.

User-added image