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  1. blog.enterprisedna.co › user-principal-nameUser Principal Name: A Quick Guide to UPN in Active Directory

    User Principal Names (UPN) are user attributes on Microsoft Active Directory that serve as an internet-style login for users. Developed based on the Internet standard RFC 822 , UPNs take an email address format, consisting of a username and a domain.

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  2. d365hub.com › Posts › DetailsUser Principal Name: A Quick Guide to UPN in Active Directory

    Jul 6, 2023 · If you're new to Active Directory and feeling overwhelmed by the terminology, look no further than this quick guide to understanding the UserPrincipalName, or UPN. This attribute serves as a critical component of Active Directory, providing a unique identifier for each registered user.

  3. blog.schertz.name › 2012 › 08Understanding Active Directory Naming Formats – Jeff Schertz ...

    • Domain Names
    • Legacy Domain Name
    • DNS Domain Name
    • User Names
    • Legacy User Logon Name
    • User Logon Name
    • Authentication Formats
    • Legacy
    • User Principal Name

    Active Directory supports two separate types of domain name formats since it’s introduction into Windows Server 2000.

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    The Legacy Domain Name parameter, which is also commonly referred to as the NetBIOS Domain Name, is a carryover from Windows NT and is limited to 15-characters. (NetBIOS names are 16-characters in length but the last character is hidden and is used to identify the name record type.) This is the value commonly used with the DOMAIN\usernameformat whe...

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    The DNS Domain Name parameter was added in Active Directory with the release of Windows 2000 and supports up to 24-characters for the hostname portion, but the Fully Qualified Domain Name can be much longer (e.g. subdomain1.subdomain2.domain.com). As indicated in the screenshots above the sample environment is using a legacy domain name that is sho...

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    Just as with domain names there are two different formats in Active Directory for storing user names:

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    The User Logon Name (Pre-Windows 2000) is the legacy format from Windows NT and is often referred to using the raw attribute name of sAMAccountName. This field is limited to a maximum of 20 characters and is used in conjunction with the legacy (or NetBIOS) domain name.

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    The User Logon Nameis a the newer username format which is often mistakenly referred to as the User Principal Name (UPN). That term is used to indicate the entire user name and domain name format.comprised of the User Logon Name and the UPN Suffix which is shown in the drop-down menu in the screenshot below. Just as with domain name formats the use...

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    Once the user name and domain name formats are clearly identified then they are assembled into pairs in specific formats to be used for authentication. The ubiquitous NTLM authentication used in Windows Server can support two different formats.

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    The legacy format requires that the Legacy (NetBIOS) Domain Name value is used with the legacy User Logon Name (sAMAccountName).

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    The newer User Principal Name format is comprised of the User Logon Name (not the legacy sAMAccountName) and the UPN Suffix assigned to the specific user account. It is important to understand that although the DNS Domain Name is the default assigned UPN Suffix for all user accounts created in the domain this value can be changed and customized in ...

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  4. kb.iu.edu › d › atzpUser Principal Names (UPNs) in Active Directory

    Apr 2, 2019 · In Active Directory, the User Principal Name (UPN) attribute is a user identifier for logging in, separate from a Windows domain login. For more, see Microsoft's User Naming Attributes . The format of the UPN attribute at IU is username@iu.edu .

  5. stackoverflow.com › questions › 45047129Where is the UPN claim for a guested user? - Stack Overflow

    Jul 13, 2017 · The value of the unique_name claim for guest users from other Azure AD tenants will be the user's UPN, if available, or otherwise falls back to the user's email address. For other types of guest users, the unique_name will take other formats & values.

  6. learn.microsoft.com › en-us › windows-serverConfiguring Alternate Login ID | Microsoft Learn

    Feb 13, 2024 · Active Directory Federation Services (AD FS) enables federated applications using AD FS to sign in using alternate ID. This enables administrators to specify an alternative to the default UPN to be used for sign-in. AD FS already supports using any form of user identifier that is accepted by Active Directory Domain Services (AD DS).

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  8. rogercruz.atlassian.net › wiki › spacesWhat Is UPN (User Principal Name) In AD? - Windows - Roger Cruz

    In Active Directory, the User Principal Name (UPN) attribute is a user identifier for logging in, separate from a Windows domain login. For more, see Microsoft's User Naming Attributes. It has the format of an email address (eg: rogercruz@example.com). Documentation User Naming Attributes. Active Directory Domain Services Tips and Tidbits

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