Linux cli get public ip

How To Find My Public IP Address From Command Line On a Linux

H ow do I find out my public IP address on the Linux and OS X Unix command line to use with my own bash shell script without using third party web site? Is there command-line option which will show my dynamic IP address on a Ubuntu or Fedora Linux?

There are many ways to find out your public IP address or wan (Wide Area Network) IP on a Linux or Unix-like operating systems such as FreeBSD, OpenBSD, NetBSD, Apple OS X, and others.

Tutorial details
Difficulty level	Easy
Root privileges	No
Requirements	Linux, macOS, WSL or Unix-like OS
Est. reading time	2 mintues

This page explain how to find out your own IP address using command line options on an Ubuntu, Debian, CentOS Linux, macOS/OS X and Unix bash shell.

Explain IP addresses

An IP is short for Internet Protocol. It is used to identify computers or mobile devices on the Internet. Each device connected to the Internet has an IP address. IP address can be used to personalize information.

Use dig command for determining my public IP address:

1. Open the Terminal application on Linux or Unix.
2. Type the following dig (domain information groper) command on a Linux, OS X, or Unix-like operating systems to see your own public IP address assigned by the ISP:
   dig +short myip.opendns.com @resolver1.opendns.com
3. You can also type:
   dig TXT +short o-o.myaddr.l.google.com @ns1.google.com
4. You should see your IP address on screen. This is the fastest way to find out your IP address without using 3rd party site.

Fig.01: Use dig command to find your IP address

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4 Ways to Find Server Public IP Address in Linux Terminal

In computer networking, an IP (Internet Protocol) address is a numerical identifier assigned permanently or temporarily to every device connected to a network that uses the Internet Protocol for communication. Its two major functions are to identify a network or host on a network and also serve for location addressing.

There are currently two versions of IP addresses: IPv4 and IPv6, which can either be private (viewable within an internal network) or public (can be seen by other machines on the Internet).

Additionally, a host can be assigned a static or dynamic IP address depending on the network configurations. In this article, we will show you 4 ways to find your Linux machine or server public IP address from the terminal in Linux.

1. Using dig Utility

dig (domain information groper) is a simple command line utility for probing DNS name servers. To find your public IP addresses, use the opendns.com resolver as in the command below:

2. Using host Utility

host command is an easy-to-use command line utility for carrying out DNS lookups. The command below will help to display your systems public IP address.

Important: The next two methods employ third party websites to display your IP address on the command line as described below.

3. Using wget Command Line Downloader

wget is a powerful command line downloader that supports various protocols like HTTP, HTTPS, FTP and many more. You can use it with third party websites to view your public IP address as follows:

4. Using cURL Command Line Downloader

curl is a popular command line tool for uploading or downloading files from a server using any of the supported protocols (HTTP, HTTPS, FILE, FTP, FTPS and others). The following commands displays your public IP address.

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How to Find Your Public IP Address on Linux Command Line

This Linux quick tip will show you many different way to get your public IP address from the command line using different tools. Since not all Linux distributions have the same set of packages (programs) installed, some of these example may or may not work on your system. For example, default Red Hat and CentOS installations do not have the dig tool installed.

All of these options will depend on external sources. We will try to use as many different sources as possible in the examples to ensure reliability.

Using the curl Command

Curl is a tool used to transfer data to and from a server using many different supported protocols. Here we will use the HTTPS protocol to pull a webpage and grep to extract our public IP address. Here are some examples of how to get your public IP address from the command line using curl.

The ipaddr.pub service can also provide additional information from the command line. You can find a complete list of options on the ipaddr.pub website.

Using the wget Command

The wget command is a command line utility for non-interactive download of files from the web. It supports most HTTP, HTTPS, and FTP as well as connecting through a HTTP Proxy server. Here are some examples of how to get your public IP address from the command line using wget.

Using the dig Command

The dig command is a command line tool for querying DNS servers. This utility is not always available. If you want to install dig, it is usually packaged in bind-utils on Red Hat based distros and dnsutils on Debian based distros. Here are some examples of how to get your public IP address from the command line using dig.

Using the host Command

The host command is a simple command line utility for performing DNS queries. Here are some examples of how to get your public IP address from the command line using the host command.

Using the nslookup Command

The nslookup command is tool that queries DNS Servers, much like dig. This command is available on many operating systems including Linux, UNIX and Windows. Here are some examples of how to get your public IP address from the command line using nslookup.

Conclusion

There are many different ways to get your public IP address from the command line. Which you use will mostly depend on what is installed on your system. Our preferred method would be from a DNS server using the dig command, but as we stated, dig isn’t always available.

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Linux command for public ip address

I want command to get Linux machine(amazon) external / public IP Address.

I tried hostname -I and other commands from blogs and stackoverflow like

and many more. But they all are giving me internal IP Address.

Then I found some sites which provides API for this.

Example : curl http://ipecho.net/plain; echo

But I don’t want to rely on third party website service. So, is there any command line tool available to get external IP Address?

12 Answers 12

simplest of all would be to do : curl ifconfig.me

A cleaner output

You could use this script

But that is relying on a third party albeit a reliable one. I don’t know if you can get your external IP without asking someone/somesite i.e. some third party for it, but what do I know.

you can also just run:

This is doing the same thing as a command the -4 is to get the output in Ipv4

I would suggest you to use the command external-ip ( sudo apt-get install miniupnpc ) as it (I’m almost sure) uses upnp protocol to ask the router instead of asking an external website so it should be faster, but of course the router has to have upnp enabled.

It might not work on amazon because you might be using NAT or something for the server to access the rest of the world (and for you to ssh into it also). If you are unable to ssh into the ip that is listed in ifconfig then you are either in a different network or dont have ssh enabled.

You can use this command to get public ip and private ip(second line is private ip; third line is public ip.)

This is the best I can do (only relies on my ISP):

Or, the functionally same thing on one line:

to save it to a temporary & hidden file add > .extIP to the end of the last line, then cat .extIP to see it.

If your ISP’s address never changes (honestly i’m not sure if it would or not), then you could fetch it once, and then replace $ISP in line two with it

This has been tested on a mac with wonderful success. the only adjustment on linux that I’ve found so far is the traceroute «-M» flag might need to be «-f» instead and it relies heavily on the ping’s «-R» flag, which tells it to send back the «Record Route» information, which isn’t always supported by the host. But it’s worth a try!

the only other way to do this without relying on any external servers is to get it from curl’ing your modem’s status page. I’ve done this successfully with our frontier DSL modem, but it’s dirty, slow, unreliable, and requires hard-coding your modem’s password. Here’s the «process» for that:

That fetches the raw html, searches for any lines containing «WanIpAddress =» (change that so it’s appropriate for your modem’s results), and then narrows down those results to an IPv4 style address.

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How to find your Public IP Address in Linux

Finding your device IP address(s) can be useful for various purpose. For instance, configuring a firewall, DNS and networking.

IP addresses can be divided into two major categories, public and private. Public IP is unique and can be accessed from the Internet, which is provided by the ISP (Internet Service Provider), whereas private IP addresses are reserved for internal use on the private network.

The public IP addresses are commonly used by home routers, websites, servers, etc,.

This article describes several ways to identify the public IP address of a domain and Linux system from the Linux terminal.

Refer the following guide to find your Linux system Private IP address.

The below five commands can be used to identify multiple domain & Linux system IP addresses:

• dig Command: dig is a flexible cli tool for interrogating DNS name servers.
• host Command: host is a simple utility for performing DNS lookups.
• nslookup Command: Nslookup command is used to query Internet domain name servers.
• fping Command: fping command is used to send ICMP ECHO_REQUEST packets to network hosts.
• ping Command: ping command is used to send ICMP ECHO_REQUEST packets to network hosts.

To demonstrate this, we created a file called “domains-list.txt” and added the following domains.

Method-1: Using dig command

dig command (stands for “domain information groper”‘) is a powerful and flexible command-line tool for querying DNS name servers.

It performs DNS lookup against a given host & website and displays the corresponding public IP addresses of the website and host as shown below:

Use the following bash script to find the multiple Linux systems and domain’s public IP addresses:

Once the above script is added to a file, set the executable permission for the “dig-command.sh” file:

Finally run the bash script to get the output.

If you want to run the above script in one line, use the following script:

Alternatively, you can use the following shell script to find the IP address of the multiple Linux host and domain:

Method-2: Using host command

Host command is a simple CLI application to perform DNS lookup. It is commonly used to convert names to IP addresses and vice versa.

To view the domain or Linux system public IP address with host command, use the following customized host command:

Use the following bash script to find the public IP addresses of multiple host and domain’s:

Once the above script is added to a file, set the executable permission for the “host-command.sh” file:

Finally run the bash script to get the output as shown below:

Method-3: Using nslookup command

nslookup command is a program for querying Internet domain name servers (DNS). It is a network administration tool that helps diagnose and resolve DNS related issues.

We need to add a lot of options with nslookup command to find the public IP address of your Linux system and domain as shown below.

Use the following bash script to find the public IP addresses of multiple domain’s and Linux system:

Once the above script is added to a file, set the executable permission for the “nslookup-command.sh” file.

Finally run the bash script to get the output as shown below:

Method-4: Using fping command

fping command is a program such as ping, which uses the Internet Control Message Protocol (ICMP) echo request to determine whether a target host is responding.

fping differs from ping because it allows users to ping any number of hosts in parallel.

Use the following options with fping command to find multiple domain and Linux host public IP address.

Method-5: Using ping command

ping command (stands for: Packet Internet Groper) is a networking utility that is used to test the availability/connectivity of a target host on an Internet Protocol (IP) network.

It verifies the availability of a host by sending Internet Control Message Protocol (ICMP) Echo request packet to the target host and waiting for an ICMP Echo reply.

It summarizes statistical results based on the packets transmitted, packets received, packet loss, typically including the min/avg/max times as shown below:

Use the following bash script to find the public IP addresses of multiple domain’s and Linux system :

Once the above script is added to a file, set the executable permission for the “dig-command.sh” file:

Finally run the bash script to get the output as shown below:

Method-6: Using resolveip command

The resolveip utility resolves host names to IP addresses and vice versa as shown below:

Conclusion

We have shown you several commands to find out the public IP address of a website or domain and Linux system.

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