That's a very big block of scarce IPv4 addresses that have become available again. One block inside this /8, more specifically 18.104.22.168/16, was transferred to Amazon.
Net Range: 22.214.171.124 -- 126.96.36.199
Net Type: Allocated to ARIN
Organization: American Registry for Internet Numbers (ARIN)
Update: more details of MIT's IPv4 sale are now available.