Netstat commands

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.

List all tcp ports.

# netstat -at : To list all tcp ports

List all udp ports.

# netstat -au : To list all udp ports.

List only listening ports.

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

List only listening TCP ports.

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

List only listening UDP ports.

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

List only the listening UNIX ports

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

List the statistics for all ports.

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

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.

Display PID and program names in the output.

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

Print the netstat information continuously.

netstat will print information continuously every few seconds.

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

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 :

The kernel routing information.

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

The port on which a program is running.

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

Which process is using a particular port:

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

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

another essential command lines:

netstat -ano

netstat -anp

netstat -anr

Published @ March 24, 2022 6:15 am