Third party firewall or internet security software often displays a list of all the TCP/UDP connections being made by various programs in your PC. Using this dynamically updating connections list, you can see which of the applications are making connections to which of the online servers, their ports, the remote IP addresses and more. But Windows Firewall or Windows Defender Firewall does not display any such status.
If you are not using any third party firewall software and depend on the Windows Firewall, then you can use a tool like TCPView or CurrPorts to see the list of all the programs and their remote connections. Another similar portable software, but smaller in both file size and window size, is PortExpert.
PortExpert displays a list of all the currently open connections to remote servers. In the list it displays, the process ID, the protocol used (TCP or UDP), process name, remote IP address and the remote port used. There are options to freeze the list so that it is not dynamically updated, display system processes in the list (like Windows services svchost.exe) and display local connections in addition to the remote connections.
If you select a process from the list, it will display various details about the selected process such as process name, process ID, local IP address, local port, remote IP address and the remote port. You can perform whois on the selected connection which opens a webpage displays whois data for the remote IP address for that connection. You can search for the process on the internet. You can open the folder containing the executable files for the selected process. You can also try opening the remote IP address in your web browser which works only if the remote IP address belongs to a website.
Verdict: PortExpert is not as comprehensive as TCPView, but it does display all the current open ports and the connections being made by various applications. It can be used to monitor when and which applications are trying to connect to the internet.
You can download PortExpert from https://www.kcsoftwares.com/?portexpert.