Where does IPython look for info when trying to connect to kernel

I start kernel:

========================================
> ipython kernel
NOTE: When using the `ipython kernel` entry point, Ctrl-C will not work.

To exit, you will have to explicitly quit this process, by either sending
"quit" from a client, or using Ctrl-\ in UNIX-like environments.

To read more about this, see https://github.com/ipython/ipython/issues/2049


To connect another client to this kernel, use:
    --existing kernel-10128.json
========================================

Where is "kernel-10128.json" located?

I dont see it in ~/.ipython/profile_default/security nor anywhere in
~/ipython subfolders nor in temp location.

If I try with `ipython console --existing` I connect successfully, but not
from IPython instance that I point to custom path with IPYTHONDIR env (path
that kernel instance is using).

If last sentence is confusing, ignore it, I'm just interested where is this
file located?

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