How to find the ID of a views block that is not assigned to a region? The title pretty much says it all. I need to find the ID of a Views block that is not assigned to any region, in Drupal 7.
you can edit that view, move your mouse on the "block" that you need to analyze and see the url.Like this one:

http://mydomain.ext/admin/structure/views/view/flag_bookmarks/edit/page_4

The last url path is the page id: page_4. 
In your case all start with "block_".