For Big Sur and later:
sudo lsof -i -P | grep LISTEN | grep :$PORT |
Where $PORT is the port you are looking for. Ex: 3306
Quick Tip: Who is listening on given TCP port on MacOS?
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For Big Sur and later:
sudo lsof -i -P | grep LISTEN | grep :$PORT |
Where $PORT is the port you are looking for. Ex: 3306