find-the-process-using-a-specific-port.md

Find The Process Using A Specific Port

The netstat utility is often recommended for finding the PID (process ID) bound to a specific port. Unfortunately, Mac's version of netstat does not support the -p (process) flag. Instead, you'll want to use the lsof utility.

$ sudo lsof -i tcp:4567

Running this will produce a nicely formatted response that tells you several pieces of information about the process bound to :4567 including the PID.

source