See which ports are open on your machine

List listening ports and the programs behind themNeeds sudo
Terminal
```
sudo lsof -iTCP -sTCP:LISTEN -n -P
```

List listening ports and the programs behind themNeeds sudo
Terminal · Ubuntu / Debian
```
sudo ss -tulpn
```

List listening ports and the programs behind them

PowerShell

Get-NetTCPConnection -State Listen | Sort-Object LocalPort | Select-Object LocalAddress, LocalPort, @{n='Program';e={(Get-Process -Id $_.OwningProcess).ProcessName}}