Can I generate purely random keys without any vanity prefix

[casualdegenerate]

I want to write a bunch of hostnames, and store them into a drive.
So whenever I want to use a hostname, I can easily just search in the keys/ folder for any that have the prefix.

Current solution to this is to create an a_keys/ folder instead, but I'd love to use all generated hostnames it creates.

[casualdegenerate]

Nevermind, trying to access or list out a certain pattern with grep with these many files is not possible(with my computer at least).