batch file to get public facing ip address without any external files or help

batch_file_my_ip.cmd

@if (@This==@IsBatch) @then
@echo off & setLocal EnableDelayedExpansion & CHCP 65001 >NUL
:: Copyright Conor McKnight
:: https://github.com/C0nw0nk/
:: https://www.facebook.com/C0nw0nk
:: Execute Javascript without needing to install anything
:: store javascript output in batch file variable

set site="https://checkip.amazonaws.com/"
for /f "tokens=*" %%a in ('
cscript //nologo //E:JScript ^"%~dpnx0^"^ %site%
') do set "javascript_output=!javascript_output!%%a"

echo !javascript_output!

pause
exit /b

@end
//Javascript
// Instantiate the needed component to make url queries
var http = WScript.CreateObject('MSXML2.ServerXMLHTTP.6.0');

// Retrieve the url parameter
var url = WScript.Arguments.Item(0)

//Make the request
http.open("GET", url, false);
http.send();

//If we get a OK from server (status 200), output to console
if (http.status === 200) WScript.Echo(http.responseText);

//Close script
WScript.Quit(0);