ssh-keyscan

Get the public ssh keys of remote hosts. More information: https://man.openbsd.org/ssh-keyscan.

• Retrieve all public ssh keys of a remote host:
  ssh-keyscan {{host}}
• Retrieve all public ssh keys of a remote host listening on a specific port:
  ssh-keyscan -p {{port}} {{host}}
• Retrieve certain types of public ssh keys of a remote host:
  ssh-keyscan -t {{rsa,dsa,ecdsa,ed25519}} {{host}}
• Manually update the ssh known_hosts file with the fingerprint of a given host:
  ssh-keyscan -H {{host}} >> ~/.ssh/known_hosts