Your external IP address can change from time to time based on your ISP (Internet Service Provider) and their settings. You have no control over your external IP address. It is the address that your ISP assigns to you.
The usual way of determining what your external IP address is is to visit a web page that reports it back. Web servers always know your external IP address because this is how they send data back to you as you navigate the web.
As of right now, your external IP address is:
44.220.251.236
Remember this can change at any time as your ISP is in control of it. Any time you need to know your external IP address you can simply come back to this page and your current external IP address will be displayed.