Last updated on August 20, 2020 by Dan Nanni
Suppose your Linux machine is behind a NAT router. Then what is visible to your machine is only a private IP address (e.g.,
172.16.x.x) assigned to its LAN interface. Then how can you detect the public (or WAN) IP address assigned to the NAT router, preferably from command line?
Here is how to find the public IP address from command line on Linux.
You first need to install
curl as you need to rely on an external web server to get your public IP address.
On Debian, Ubuntu or Linux Mint:
$ sudo apt-get install curl
On Fedora, CentOS or RHEL:
$ sudo yum install curl
The following shows a list of commands that you can run to determine the public IP address. The output of any of these commands will be your public IP address. You can define an alias using one of these commands, or use one directly in a shell script.
$ curl ifconfig.me
$ curl icanhazip.com
$ curl ipecho.net/plain
$ curl whatismyip.akamai.com
$ curl myip.dnsomatic.com
$ curl -s checkip.dyndns.org | sed -e 's/.*IP Address: \([0-9.]\+\).*/\1/g'
If there is any command in the above that no longer works, or any new site that is command-line friendly, let me know.
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