In Drupal, there isn't a flag that set a page as administration page, and a tag that set a page/block for end users.
What makes a page for administrator users is the permission that users needs to have to see that page. A settings page requiring the users to have the permission to administer users is considered an administration page; the same is true for a setting page requiring the permission "administer content type," or "administer nodes."
If you have a page that needs to be seen only from administrators, then you need to use an existing administration permission, or implement a module that implement the specific permission that you need.
A block implemented by Views can use the permission implemented in other modules as well, and you can set the permission users need to have to view a block (or in general, a view) created with Views.