Thanks for sharing, I guess I'll try to write some code to bruteforce some of the smallest unclaimed keys, though I don't hope to find anything, cause my CPU isn't very strong. I have a GTX 1060 gpu though, but I only know Javascript so it will be a bit hard to write a program that utilizes my gpu, but it should be possible. Should be a fun pet project that will at least provide me some experience.
there is no more "unclaimed" keys left with a private keys in small ranges. they were all found a long time ago. now only the big ones are remaining and claiming each is getting harder exponentially as the power of 2 is incremented by one.
if you want to have fun, you can program something. i did that a while ago in c# for small ones as a "challenge" to my skills knowing there is no other reward.