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

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