I have not it was installed, then I turned on some of the logging features like log connections etc. each line of the log starts with
< 2018-09-17 08:08:47.420 PDT > LOG: connection received: host=npt-app-09.main.popud.org port=43502
< 2018-09-17 08:08:47.421 PDT > LOG: connection received: host=npt-app-09.main.popud.org port=43500
< 2018-09-17 08:08:47.423 PDT > LOG: connection received: host=npt-app-09.main.popud.org port=43504