You could cut down the search space a lot by only enumerating the MAC addresses of known vendors (https://gist.github.com/aallan/b4bb86db86079509e6159810ae9bd3e

You could cut down the search space a lot by only enumerating the MAC addresses of known vendors (https://gist.github.com/aallan/b4bb86db86079509e6159810ae9bd3e4 https://gist.github.com/aallan/b4bb86db86079509e6159810ae9bd...). That cuts the search space down to 23000 vendors * 0xFFFFFF = 385875945000. With a hashrate of 60000MHs, you could SHA256 hash that entire space in 6.5 seconds. If you have an NVidia GTX 1080, you can do it in ~2 minutes 16 seconds.