My practice attempt to decrypt a SHA-256 hash of an IP address

[royce]

Your example in crackitBruteForce.sh will only match three-digits-per-octet IPs (111.111.111.111) and miss other possibilities (111.111.111.1, 1.1.1.1, 11.11.11.11, etc.)

This is closer: https://pastebin.com/4HQ6C8gG

Are you using GPU? iff not, when using only CPU (-D 1), hashcat should use all cores.