Netstat command in Linux

Netstat command displays various network related information such as network connections, routing tables, interface statistics, masquerade connections, multicast memberships etc.,

Examples of some practical netstat command :

1. -a -all : Show both listening and non-listening sockets. With the –interfaces option, show interfaces that are not up

   # netstat -a | more : To show both listening and 
   non-listening sockets.

   
   

2. List all tcp ports.

   # netstat -at : To list all tcp ports.
   

   

3. List all udp ports.

   # netstat -au : To list all udp ports.
   

   

4. List only listening ports.

   # netstat -l : To list only the listening ports.
   

   

5. List only listening TCP ports.

   # netstat -lt : To list only the listening tcp ports.
   

   

6. List only listening UDP ports.

   # netstat -lu : To list only the listening udp ports.
   

   

7. List only the listening UNIX ports

   # netstat -lx : To list only the listening UNIX ports.
   

   

8. List the statistics for all ports.

   # netstat -s : To list the statistics for all ports.
   

   

9. List the statistics for TCP (or) UDP ports.

   # netstat -st(TCP) : To list the statistics for TCP ports.
   

   

   # netstat -su(UDP) : List the statistics for UDP ports.
   

   

10. Display PID and program names in the output.

    # netstat -pt : To display the PID and program names.
    

    

11. Print the netstat information continuously.

    netstat will print information continuously every few seconds.

    # netstat -c : To print the netstat information continuously.
    

    

12. The non-supportive address families in the system.

    # netstat --verbose : To get the non-supportive
    address families in the system.
    

    

    At the end, we have something like this : 
    

    

13. The kernel routing information.

    # netstat -r : To get the kernel routing information.
    

    

14. The port on which a program is running.

    # netstat -ap | grep ssh : To get the port
    on which a program is running.
    

    

15. Which process is using a particular port:

    # netstat -an | grep ':80' : To get the process
    which is using the given port.
    

    

16. List of network interfaces.

    # netstat -i : To get the list of network interfaces.
    

    

    Display extended information on the interfaces 
    (similar to ifconfig) using netstat -ie:
    
    # netstat -ie : To display extended information 
    on the interfaces
    

    


Reference :
Linux Manual page for netstat

This article is contributed by Kishlay Verma. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.