this might be a dumb question, but i want to ask that is the range of private keys which have P2PKH addresses, i searched for a answer and i found that it is between 2^96 - 2^97

i have one more doubt, let's say i have a public key (not for the puzzle), what input should i give in the start and end range?

can you explain me how does kangaroo works, for example if i have a public key for a bitcoin address can i use kangaroo to brute-force it's private key?

I wanted to ask if someone got the public key for #66 as i have tried to bruteforce it but my hardware is not capable of doing so, if someone can link any code or algorithm (or even the public key if you have it).