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The netstat command

The term netstat stands for Network Statistics. In layman’s terms, netstat command displays the current network connections, networking protocol statistics, and a variety of other interfaces.

Check if you have netstat on your PC:

netstat –v

If you don't have netstat installed on your PC, you can install it with the following command:

sudo apt install net-tools

You can use netstat command for some use cases given below:

• Netstat command with -nr flag shows the routing table detail on the terminal.

Example:

netstat  -nr

• Netstat command with -i flag shows statistics for the currently configured network interfaces. This command will display the first 10 lines of file foo.txt .

Example:

netstat  -i

• Netstat command with -tunlp will gives a list of networks, their current states, and their associated ports.

Example:

netstat -tunlp

• You can get the list of all TCP port connection by using -at with netstat.

netstat  -at

• You can get the list of all UDP port connection by using -au with netstat.

netstat  -au

• You can get the list of all active connection by using -l with netstat.

netstat  -l