It is the SSH fingerprint
The fingerprint is used for identifying the server/machine you are connecting to, it is based on the server's Public key.
And yes it is safe to share it, as it is based on public key which is available to all
Fingerprints are unique way of identifying the host you are connecting to, they are a simple representation of Host key
Host keys are normally generated automatically when OpenSSH is first installed or when the computer is first booted.
Host keys are usually stored in the
/etc/ssh directory, in files starting with
You can check the host key fingerprint :
$ sudo ssh-keygen -l -f /etc/ssh/ssh_host_rsa_key
2048 SHA256:qEx0sZHQnkl5lOWN7y0geX6e1Y9lxGocluDvHtMgeOM root@197nodnb20354 (RSA)
If the fingerprint changes, the machine you are connecting to has changed their public key (happens from re-installing ssh), but it could also indicate that you are connecting to a different machine at the same domain/IP or that you are being targeted with a man-in-the-middle attack.