The netstat -tulpn command is used to display active network connections and their corresponding processes on a system. Here’s a breakdown of each option:

• -t: Display TCP connections.
• -u: Display UDP connections.
• -l: Show only listening sockets.
• -p: Show the PID (process ID) and name of the program to which each socket belongs.
• -n: Show numerical addresses instead of resolving hostnames.

So, netstat -tulpn will list all TCP and UDP connections, show the listening sockets, display the associated process with each connection (along with its PID), and show numerical addresses instead of resolving hostnames. This can be useful for network troubleshooting and monitoring purposes.