ss - another utility to investigate sockets

ss is used to dump socket statistics. It allows showing information similar to netstat. It can display more TCP and state information than other tools.

TCP und UDP Ports:

ss --tcp --udp --listening

Alle TCP Sockets:

ss --tcp --all

Alle UDP Sockets:

ss --udp --all

Alle aufgebauten SSH-Verbindungen

ss -o state established '( dport = :ssh or sport = :ssh )'