If you want to protect a webserver inside your home (which seems like a good idea in 2021), you're going to need SSL -- and that requires a domain. Self signed

If you want to protect a webserver inside your home (which seems like a good idea in 2021), you're going to need SSL -- and that requires a domain. Self signed ssl certs were kinda a solution to this -- and then were largely rejected as being absolutely "insecure" because they, well, were absolutely insecure.