Debian – How to get systemd to tell me why init is listening on a particular port

I am configuring a BeableBone Black running a Debian image from BeagleBone.org.

I can see that init (i.e. systemd) is listening on ports 1880 and 3000.

debian@beaglebone:~$ sudo netstat -taunp | grep LISTEN
tcp        0      0 0.0.0.0:53              0.0.0.0:*               LISTEN      978/dnsmasq         
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      852/sshd            
tcp6       0      0 :::53                   :::*                    LISTEN      978/dnsmasq         
tcp6       0      0 :::22                   :::*                    LISTEN      852/sshd            
tcp6       0      0 :::1880                 :::*                    LISTEN      1/init              
tcp6       0      0 :::3000                 :::*                    LISTEN      1/init              

Previously, init was also listening on port 80. I disabled that with these commands from https://stackoverflow.com/a/16570889 :

systemctl disable bonescript.service
systemctl disable bonescript.socket
systemctl disable bonescript-autorun.service

How can I get system to tell me which services are listening on ports 1880 and 3000?