On the Devices screen, 'Not in a Group' grid, you're able to Find by - Device nickname, Host name, last logged in user, and get a list of matches but not by a partial IP address. Ex: 10.23.1 (Please include or provide a Filter by for this field)
Also, when you are using a field to Sort by, indicated by the ^ caret, then perform a Find by and view the result, when you clear the Find and are returned to the 'Not in a Group' grid, you are no longer Sorted by the same field, the sort field is cleared.