1. @ECHO OFF
2. :: This will add an ipv4 entry to the hosts file, redirecting ipv6 requests to ipv4
3. :: This must be run as administrator
4. SET domain=apollo.rip
5. SET NEWLINE=^& echo.
6. SET hostsfile="%WINDIR%system32driversetchosts"
7.  
8. :: check if you set the domain
9. IF %domain%  EQU ididntsetthis (
10.     ECHO ERROR: You didn't set the domain in this file. Change "ididntsetthis" to some domain.
11.     ECHO i.e. SET domain=google.com
12.     goto:eof
13. )
14.  
15. :: check if administrater
16. NET SESSION >nul 2>&1
17. IF NOT %ERRORLEVEL%  EQU 0 (
18.     ECHO ERROR: You didn't run this script with administrative privleges.
19.     ECHO It will not be able to write to the hosts file.
20.     goto:eof
21. )
22.  
23. :: get ipv4 address
24. FOR /f "tokens=1,3 delims=: " %%A IN ('ping -n 1 %domain% -4'') DO IF %%A==Reply SET ipaddress=%%B
25.  
26. ECHO Uupdating the following to hosts file
27.  
28. :: remove existing entry
29. findstr /v %domain% %hostsfile% > %hostsfile%.tmp
30. move /Y %hostsfile%.tmp %hostsfile%
31.  
32. :: append hosts file
33. FIND /C /I "%domain%" %hostsfile%
34. IF %ERRORLEVEL% NEQ 0 ECHO %NEWLINE%^%ipaddress% %domain% >> %hostsfile%
35.  
36. ECHO Hosts updated with %ipaddress%     %domain%