Welp. My brain reached for the name of the tool used to show the process identification numbers (PIDs) for processes using various ports.
But, it couldn't come up right away with fuser.
So, here I am, leaving a memento of sorts to help me.
Getting older, have a lot beyond networking to think about, & use ss, lsof, and fuser much less often these days, less often than I probably should, in fact.
So, here we are.