thanks for sharing the scanned ranges, I am happy and sad at the same time that you will find the puzzles #64 I was working on it some time ago .. but hey !! that's the way things are i'm currently working on puzzle #120
the ranges scanned at this time by me are:
800000000000000000000000000000:8fffffffffffffffffffffffffffff
900000000000000000000000000000:9fffffffffffffffffffffffffffff

I'm currently on e10ffffffffffffffffffffffffffff:efffffffffffffffffffffffffffffff (just started today)  ~442 PetaKeys/s
https://i.ibb.co/9Y7jGtX/rango-nuevo-120.png