Displays all apps with an active internet connection on your ? device.

Tap on one app to see all of its different network connections.

On this detail page you can even force an app to ⛔ exit which ❌ closes all of its opened connections (however you can't shut down system apps and processes).

Here you can see the netstat state of each socket.
You can even forward this list through ? email.

Tap on one connection to performe a whois query.

Handles both TCP and UDP connections TCPIP ver. 4 and ver. 6.

You can filter each different netstat state through the apps settings. The default setting will only show you apps that have an established connection to the internet.