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iftop command in Linux with Examples

Last Updated : 15 Jul, 2025

The 'iftop' command is a powerful network analysis tool used by system administrators to monitor real-time bandwidth usage on network interfaces. It provides a quick and detailed overview of networking activities, helping diagnose network issues by identifying which applications or processes are consuming the most bandwidth. It stands for 'Interface TOP' and the top is derived from the top command in Linux. It even acts as a diagnostic to 'diagnose' which program is causing the problem to the network.

Installing 'iftop' on Linux varies slightly depending on the distribution you are using. Below are the installation steps for RedHat-based systems and Debian or Ubuntu systems:

yum install epel-release

yum install  iftop

sudo dnf install epel-release
sudo dnf install iftop

sudo apt install iftop

Options

Description

iftop

Displays basic real-time bandwidth usage of the default network interface.

-i wlo1

Shows real-time bandwidth details of a specific network interface named "wlo1".

-n -i wlo1

Disables hostname lookup and provides bandwidth statistics for the specified interface "wlo1".

-N -i wlo1

Disables the conversion of port numbers to services and presents bandwidth stats for the specified interface "wlo1".

-b

Turns off the display of the bar graph representation for network traffic.

-t

Presents the output in a text interface format without using ncurses.

-o source

Sorts the output based on the source IP address of network flows.

-o destination

Sorts the output based on the destination IP address of network flows.

-L 2 -i wlo1

Specifies that only 2 lines of statistics or bandwidth usage should be printed for the interface "wlo1".

-h

Displays the help section providing usage information and options for the iftop command.

iftop

This command will now display all the bandwidth related stats of the default interface.

sudo iftop -i wlo1

This command will now display all the bandwidth related stats of the specified network interface which is wlo1.

sudo iftop -n -i wlo

This command will now stop the lookup of the hostname for the specified network interface which is 'wlo1'.

sudo iftop -N -i wlo1

This command will not convert the port number to services while printing stats for the specified network interface which is 'wlo1'.

sudo iftop -b

This command will remove the bar graph of traffic from the output.

sudo iftop -t

This command will display the output in the text interface without 'ncurses'.

sudo iftop -o source 

This command will sort the output on the basis of the source address.

sudo iftop -o destination

This command will sort the output on the basis of the destination address.

sudo iftop -L 2 -i wlo1

This command will print 2 output lines of statistics or bandwidth usage and not more than 2 lines will be printed.

sudo iftop -h

This command will display the help section of the iftop command.

In this article we discussed 'iftop' command which is a valuable network analysis tool for administrators, providing real-time bandwidth usage stats and aiding in network troubleshooting. With customizable options, it offers efficient monitoring and sorting capabilities. By installing 'iftop' on Linux distributions, administrators can gain insights into network traffic and optimize network performance effectively.

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