Apple - What is the equivalent of netstat -tln on OS X?

Should be this command:

sudo lsof -iTCP:$PORT -sTCP:LISTEN

Who is listening on a given TCP port on Mac OS X?

The closest equivalent you can get on macOS is:

netstat -p tcp -van | grep '^Proto\|LISTEN'

tu options are not available, but they can be replaced by either -p tcp or -p udp, although you can't have both at the same time
-p option is replaced with -v which effectively gets you PIDs listed
-l option is not available, but you can work around it by using -a option (which includes servers in the listing) and grep LISTEN (to filter only for listening)

For real-time monitoring, try this:

nettop -p 60683

You can also restrict the interface type, like wifi or wired...

nettop -t wifi -n -p 60683

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