netstat

netstat can be installed from net-tools package. The netstat is often used to display open ports, packet details and network usage.

// Show all listening TCP ports
# netstat -alt
// Show routing table
# netstat -r
// Show multicast group membership information
# netstat -g

// List all network interfaces with specific properties
# netstat -i
// List summary of statistics for each protocol
# netstat -s

// List all TCP connections 
# netstat -a --tcp

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