Wikipedia talk:IP Hash

did anything ever come of this?

I think it would go a long way to ending the sock puppet problem. – Þ 08:57, 7 March 2007 (UTC)[reply]

Don't think about it as about hash - like sha256(ip). IP space is small, it's trivial to build a dictionary.
If it would be something like sha256(ip + secret_key), privacy of all ips depends on secrecy of that secret_key, forever. There is now way how the system would be able to recover from successful attack.
IP data are often misleading without further investigation and good understanding of internet technology. Its trivial to foil such test, false positives are certain