Recently, I learned that macOS allows a regular user process to bind to a privileged port.
To test this out, in one terminal, do:
$ nc -l 0.0.0.0 80
In a second terminal, talk to the process listening on port 80:
echo "hello world" | nc 127.0.0.1 80
The first terminal should now print:
hello world
Cool eh? Happy networking!
