[Iska]

Например:

Код:

@echo off
setlocal enableextensions enabledelayedexpansion

for /f "usebackq delims=^<" %%i in (
	`wget.exe -qO- "http://api.wipmania.com/"`
) do set sExternalIP=%%i

if defined sExternalIP (
	echo [%sExternalIP%]
) else (
	echo Can't determine external IP
	exit /b 1
)

endlocal
exit /b 0