What you have is a hashed known_hosts file, which is the default. These are one-way hashes of the host|key, so you cannot recover the actual hostname. This is intentional, as knowledge of all the hosts you have accessed and cached keys for (and, perhaps more importantly, knowing which ones you haven't) is fairly valuable to someone who wants to fool you into sharing your passwords with them. Its not enough if you're using SSH keys, as you may do something sensitive while logged in through an attacker's machine.
What you should do is ssh to all your machines, and verify the fingerprint carefully when doing so. Once you have all of them, you can distribute this known_hosts file to the clients that need it. Note that you can put it in /etc/ssh/known_hosts so that all users get it, not just your current user.