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Re:SSH known_hosts hash cracking with Hashcat by aussieguy1234 on Thursday September 27, 2018 @12:43AM (#18082143)
Put the 16 million IP addresses and their hashes into a sql database table and index the field.

Like a rainbow table attack for passwords, but for IPs

Re:SSH known_hosts hash cracking with Hashcat by namanyayg on Thursday September 27, 2018 @12:44AM (#18082148)
They are salted.