sudo netstat --listen:
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 *:19444 *:* LISTEN
tcp 0 0 *:19445 *:* LISTEN
tcp 0 0 *:ssh *:* LISTEN
tcp6 0 0 [::]:ssh [::]:* LISTEN
udp 0 0 *:57309 *:*
udp 0 0 *:mdns *:*
udp 0 0 *:bootpc *:*
udp 0 0 raspberrypiZERO.fri:ntp *:*
udp 0 0 localhost:ntp *:*
udp 0 0 *:ntp *:*
udp6 0 0 [::]:mdns [::]:*
udp6 0 0 [::]:59451 [::]:*
udp6 0 0 fe80::9dac:12b6:508:ntp [::]:*
udp6 0 0 localhost:ntp [::]:*
udp6 0 0 [::]:ntp [::]:*
raw6 0 0 [::]:ipv6-icmp [::]:* 7
Active UNIX domain sockets (only servers)
Proto RefCnt Flags Type State I-Node Path
unix 2 [ ACC ] SEQPACKET LISTENING 4865 /run/udev/control
unix 2 [ ACC ] STREAM LISTENING 4869 /run/systemd/journal/stdout
unix 2 [ ACC ] STREAM LISTENING 11113 @/tmp/dbus-BVk8rH8Ohb
unix 2 [ ACC ] STREAM LISTENING 10280 @/tmp/.X11-unix/X0
unix 2 [ ACC ] STREAM LISTENING 10281 /tmp/.X11-unix/X0
unix 2 [ ACC ] STREAM LISTENING 12217 @/dbus-vfs-daemon/socket-IXnNJMJs
unix 2 [ ACC ] STREAM LISTENING 11703 /tmp/.pcmanfm-socket--0-pi
unix 2 [ ACC ] STREAM LISTENING 12105 /tmp/.menu-cached-:0-pi
unix 2 [ ACC ] STREAM LISTENING 12211 @/dbus-vfs-daemon/socket-yPoIlt7Z
unix 2 [ ACC ] STREAM LISTENING 11098 /tmp/ssh-p9cbFt6qC2Ha/agent.691
unix 2 [ ACC ] STREAM LISTENING 11601 /tmp/ssh-s6XWqiBlshwA/agent.872
unix 2 [ ACC ] STREAM LISTENING 8878 /var/run/avahi-daemon/socket
unix 2 [ ACC ] STREAM LISTENING 8881 /var/run/dbus/system_bus_socket
unix 2 [ ACC ] STREAM LISTENING 9142 /var/run/dhcpcd.sock
unix 2 [ ACC ] STREAM LISTENING 10941 /run/user/1000/systemd/private
unix 2 [ ACC ] STREAM LISTENING 9151 /var/run/dhcpcd.unpriv.sock
unix 2 [ ACC ] STREAM LISTENING 4842 /run/systemd/private