ssh-keygen -o -a 100 -t ed25519
sshfp generates DNS SSHFP records from SSH public keys. sshfp can take public keys from a known_hosts file or from scanning the host's sshd daemon.
LittleBlackBox is a collection of thousands of private SSL and SSH keys extracted from various embedded devices. These private keys are stored in a database where they are correlated with their public certificates as well as the hardware/firmware that are known to use those private keys.