If you're trying to figure out what your current public IP address is, there is a server you can ask. It is a server running at https://ifconfig.me.
You can visit that URL in your browser to find your IP address and some other User Agent/Request details. The site also mentions several cURL commands you can run to get these details in your terminal.
$curlifconfig.me
That will respond with just your public IP address. It is equivalent to curling ifconfig.me/ip.
There are other options as well, such as curling for a JSON response of all the data attributes.