Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

not sure what i am missing here..

every website suggests creating this reg key:


as DWORD and setting its value to 0xFFFFFFFF

i've done this, but when i reboot, my NIC adapter still shows IPV6 enabled.

since i have 64bit version, i also tried setting this value as QWORD. what am i missing here?

share|improve this question
up vote 3 down vote accepted

Just because it's turned off in registry doesn't mean your check box on NIC will dissapear. It just means it's disabled. Just to be sure I usually do it in both places (in registry and NIC properties). For Windows 7 however doing it on NIC properties should be enough, but for Exchange 2010 (as a side note) it brings Windows Server to knees.

Couple of ways to disable IPv6 completely (just for answer completeness):

  • Run this from command prompt reg add hklm\system\currentcontrolset\services\tcpip6\parameters /v DisabledComponents /t REG_DWORD /d 255 and then reboot.
  • Run this Microsoft Fixit utility

Some helpful links:

share|improve this answer
ok, how can i verify my registry change worked? and should i be using DWORD in 64bit windows? – Sonic Soul Dec 4 '10 at 22:33
Running this from prompt should do it: reg add hklm\system\currentcontrolset\services\tcpip6\parameters /v DisabledComponents /t REG_DWORD /d 255 but it's exactly as you already did it. You could verify it with ipconfig /all in cmd window. – MadBoy Dec 4 '10 at 22:37
ipconfig -all doesn't say anything about ipv6.. also should be using DWORD (32bit) value in 64bit windows? or QWORD ? – Sonic Soul Dec 4 '10 at 22:40 here's a good link to get you thru. When i did ipconfig /all on my machine it shows: Link-local IPv6 Address . . . . . : fe80::4c50:ae33:88df:5fae%12, IPv4 Address. . . . . . . . . . . : – MadBoy Dec 4 '10 at 22:44
See the "applies to" section of that MS link I posted, DWORD 32bit applies to 64bit versions also. – Moab Dec 5 '10 at 3:42

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.