I run an Ubuntu desktop with a bunch of virtual servers in Virtual Box to test stuff out, etc. In the past I have also been connecting to other kinds of remote VPS Linux boxes. Currently my
.ssh/known_hosts file has a whole bunch of keys in it, most of which are not being used any more.
I want to clean up my
.ssh/known_hosts file, but how do I know which key belongs to what host? I.e. how do I know which keys I can safely remove and which ones I should leave alone?