This recipe sniffs packets in a network using the sniff() function of Scapy. It has a monitor_packet() callback function that does the postprocessing of packets. Depending on the protocol, for example, IP or TCP, it sorts the packets in a dictionary called captured_data.

If an individual IP is not already present in the dictionary, it creates a new entry; otherwise, it updates the dictionary with the port number for that specific IP. Finally, it prints the IP addresses and ports in each line.