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ssh-keyscan — collecting host keys

cheat sheet · OpenSSH 9.6 https://lab.dimsanych.ru/en/wiki/ssh-keyscan/

Cheat sheet

ssh-keyscan server.example.com the host's public keys (to stdout)
ssh-keyscan -H server.example.com >> ~/.ssh/known_hosts add, hashing the hostname
ssh-keyscan -t ed25519 server.example.com only one key type
ssh-keyscan -p 2222 server.example.com non-standard port
ssh-keyscan -f hosts.txt a list of hosts from a file
ssh-keygen -lf <(ssh-keyscan server.example.com 2>/dev/null) fingerprints to verify

Options

Below are the main flags; the full list is in man ssh-keyscan.