notepad ile açıp ekleyebilirsiniz,

Windows 7 = C:\WINDOWS\SYSTEM32\DRIVERS\ETC\host
Windows Vista = C:\WINDOWS\SYSTEM32\DRIVERS\ETC\host
Windows XP = C:\WINDOWS\SYSTEM32\DRIVERS\ETC\host
Windows 2K = C:\WINNT\SYSTEM32\DRIVERS\ETC\host
Win 98/ME = C:\WINDOWS\host