I did a port scan using Fing on my Android phone and found that port 38037 is open on one of my Raspberry Pis. Running netstat just shows this:
tcp 0 0 0.0.0.0:38037 0.0.0.0:* LISTEN -
tcp LISTEN 0 64 *:38037 *:
I'm concerned that I have an open port that I haven't specifically opened.