Recently I learned about myhostname. What is it? “myhostname” is
glibc default configuration for namespace resolution of localhost
and _gateway. It exists entirely in userspace, and although I heard
it can do other interesting things like dynamically add custom
hostname resolution in userspace, I have not found any information on
that.
20191205/DuckDuckGo myhostname
20191205/https://www.freedesktop.org/software/systemd/man/nss-myhostname.html
Likewise, there’s the Lmhosts file on Windows, the name of local configuration file in system directory, so no-go on that. Although, again, I purportedly heard there was some sort of userspace configuration for this too.
20191205/DuckDuckGo windows lmhost
20191205/https://support.microsoft.com/en-us/help/923947/you-cannot-modify-the-hosts-file-or-the-lmhosts-file-in-windows-vista