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Windows CLAT is Now Generally Available

JimAlumbaugh's avatar
JimAlumbaugh
Icon for Microsoft rankMicrosoft
Oct 27, 2026

We’re pleased to announce that Windows CLAT (Customer-side Translator) is generally available on Windows 11 Client 25H2 starting with build 26200.9550.

  As organizations move toward IPv6-only and IPv6-mostly networks, some applications still depend on IPv4-only applications or services. Windows CLAT helps those applications continue to work when ...
Updated Oct 27, 2026
Version 2.0
464XLAT
CLAT
IPv6
windows
JiriBrejcha's avatar
JiriBrejcha
Copper Contributor
Nov 02, 2026

Congrats JimAlumbaugh​ and team, amazing news! 

Was support for this feature introduced in Windows 11 25H2, starting with build 26200.9550, with no extra tweaks out of the box? Does any Windows Update patch have to be manually installed to enable this feature on 25H2?

JimAlumbaugh's avatar
JimAlumbaugh
Icon for Microsoft rankMicrosoft
Nov 02, 2026

 

 

with no extra tweaks out of the box? 

Hi, not entirely sure what you're asking - are you wondering if there's additional configuration required other than what's documented at the links I provided above? If so, the answer is no.

Does any Windows Update patch have to be manually installed to enable this feature on 25H2

As long as you have build #26200.9550 or later installed, no additional patches are required.