Wireshark

Wireshark is an open-source tool that can capture and analyze network packets in real-time or from a capture file on a disk. It provides detailed visibility into packet-level data, supports hundreds of protocols, and includes powerful filtering, color coding, and stream reassembly features. For someone like a network administrator, it can be used to troubleshoot a network, a cybersecurity professional can use it to analyze any malicious activities on a network, and a student can use it to learn network protocols and how networks function.

The screenshot above shows a TLS-encrypted session between codeload.github.com and the IP address 192.168.68.131. The TCP stream view shows a data transfer of approximately 3.1 MB, which can be a file downloaded from the GitHub repository.

For more details: Wireshark