We have a netblock that was assigned to us out of 65.192.0.0/11 a long time ago. It has not been used in nearly a decade and still looks to be assigned to us. I'd love to see it reclaimed and reused by someone who needs it. Please contact me off list.
I've tried to give this back before, but always have hit dead ends in trying to contact the proper people. The fact that it has gone through several administrative changes doesn't help that.
I do wonder how much space is out there that is unused, unwanted, but unreclaimed by upstream providers.