How to Get Host SSH Key Fingerprints

Here’s a short command line statement that will fetch the host ssh key fingerpring without authenticating with it: 

 ssh-keyscan host | ssh-keygen -lf - 

 Here’s another way to clean up ssh host key fingerprints: 

 # remove any old fingerprints for the host

ssh-keygen -R server.example.com

# add SSH fingerprints for the host

ssh-keyscan -t ecdsa,ed25519 -H server.example.com >> ~/.ssh/known_hosts 2>&1