Normally, yes. Different kinds of blocks are listed at the bottom of an instance's "About" page. Often there's a note for each blocked instance, too, though some admins leave that blank.
I've seen a couple of servers which only show the block list to users with accounts. These tend to be restricted-membership servers, ones which don't publish their member directory or local feed, either.
I've seen a couple of servers which only show the block list to users with accounts. These tend to be restricted-membership servers, ones which don't publish their member directory or local feed, either.