Ref: Guidance for configuring IPv6 in Windows for advanced users Article 03/24/2022 5 minutes to read 7 contributors Windows Vista, Windows Server 2008, and later versions of Windows implement RFC 3484 and use a prefix table to determine which address to use when multiple addresses are available for a Domain Name System (DNS) name. By default, Windows favors IPv6 global unicast addresses over IPv4 addresses. Applies to: Windows 10 - all editions, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2 Original KB number: 929852 Summary It is common for IT administrators to disable IPv6 to troubleshoot networking-related issues such as name resolution issues. Important Internet Protocol version 6 (IPv6) is a mandatory part of Windows Vista and Windows Server 2008 and newer versions. We do not recommend that you disable IPv6 or its components. If you do, some Windows components may not function. We recommend using Prefer IPv4 ove...