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    Single-Label-Domains (SLD) in Active Directory Domain Services (AD DS)

    Explains options for transitionsing from an Active Directory domain that uses a single-label domain (SLD) name to a domain that uses a fully qualified domain name (FQDN).
    • Version:

      August 2011

      File Name:


      Date Published:


      File Size:

      3.9 MB

      KB Articles: KB300684

        An Active Directory domain name that contains one or more labels separated by a dot is referred to as a fully qualified domain name with two or more names and it will be referred as FQDN in this document. In contrast there is the concept of single-label domain (SLD), which refers to Active Directory domain names with only one label. Given that SLD is not a commonly deployed configuration and that many Microsoft and third-party applications have not been tested under an SLD configuration, Microsoft recommends FQDN Active Directory deployments. For companies who have deployed SLD, they should transition to an FQDN Active Directory deployment. This will ensure that they get the most value out of their deployed applications. For companies that will be evaluating transition to FQDN from SLD configurations, this document describes the options and considerations that they will need to take into account. In particular it describes Domain Migration and Domain Rename operations and explains the different considerations of these two options, so that companies can build a transition plan that makes sense to them.
    • Supported Operating System

      Windows Server 2003, Windows Server 2008, Windows Server 2008 R2

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