# Check open ports

If you want to check open ports on your Linux device, you can use the `ss` command (socket statistics). Older versions may use `netstat`.

### ss

Example:

```bash
ss -tulpen
```

Flags:

- `-t` → TCP
- `-u` → UDP
- `-l` → nur listening sockets
- `-p` → Prozess anzeigen
- `-e` → erweiterte Infos
- `-n` → keine DNS-Auflösung (schneller)