Well-Known SIDs

SID	Name	Description
S-1-0	Null Authority	An identifier authority.
S-1-0-0	Nobody	No security principal.
S-1-1	World Authority	An identifier authority.
S-1-1-0	Everyone	A group that includes all users, even anonymous users and guests. On computers running Windows .NET Server family, Everyone includes Authenticated Users and Guest. On computers running earlier versions of the operating system, Everyone includes Authenticated Users and Guest plus Anonymous Logon. Membership is controlled by the operating system. Note By default, the Everyone group no longer includes anonymous users on a computer that is running Windows XP Service Pack 2 (SP2).
S-1-2	Local Authority	An identifier authority.
S-1-3	Creator Authority	An identifier authority.
S-1-3-0	Creator Owner	A placeholder in an inheritable access control entry (ACE). When the ACE is inherited, the system replaces this SID with the SID for the object’s creator.
S-1-3-1	Creator Group	A placeholder in an inheritable ACE. When the ACE is inherited, the system replaces this SID with the SID for the primary group of the object’s creator. The primary group is used only by the POSIX subsystem.
S-1-3-2	Creator Owner Server	[SID not used in Windows 2000.]
S-1-3-3	Creator Group Server	[SID not used in Windows 2000.]
S-1-4	Non-unique Authority	An identifier authority.
S-1-5	NT Authority	An identifier authority.
S-1-5-1	Dialup	A group that includes all users that have logged on through a dial-up connection. Membership is controlled by the operating system.
S-1-5-2	Network	A group that includes all users that have logged on through a network connection. Access tokens for interactive users do not contain the Network SID. Membership is controlled by the operating system.
S-1-5-3	Batch	A group that includes all users that have logged on through a batch queue facility. Membership is controlled by the operating system.
S-1-5-4	Interactive	A group that includes all users that have logged on locally (interactively) or through a Remote Desktop connection. Membership is controlled by the operating system.
S-1-5-5-X-Y	Logon Session	A logon session. The X and Y values for these SIDs are different for each session.
S-1-5-6	Service	A group that includes all security principals that have logged on as a service. Membership is controlled by the operating system.
S-1-5-7	Anonymous	A group that includes all users that are logged on anonymously. Membership is controlled by the operating system.
S-1-5-8	Proxy	[SID not used in Windows 2000.]
S-1-5-9	Enterprise Controllers	A group that includes all domain controllers in an Active Directory forest. Membership is controlled by the operating system.
S-1-5-10	Self (or Principal Self)	A placeholder in an inheritable ACE on a user or computer account object or group object in Active Directory. When you grant permissions to Principal Self, you grant them to the security principal represented by the object. During an access check, the operating system replaces the SID for Principal Self with the SID for the security principal represented by the object.
S-1-5-11	Authenticated Users	A group that includes all users whose identities were authenticated when they logged on. Authenticated Users does not include Guest, even if the Guest account has a password assigned to it. Membership is controlled by the operating system.
S-1-5-12	Restricted Code	[SID not used in Windows 2000.]
S-1-5-13	Terminal Server Users	A group that includes all users who have logged on to a Terminal Services server that is in Terminal Services version 4.0 application compatibility mode. Membership is controlled by the operating system.
S-1-5-18	Local System	A service account that is used by the operating system.
S-1-5-19	NT Authority	Local Service
S-1-5-20	NT Authority	Network Service
S-1-5-<domain>-500.	Administrator	A user account for the system administrator. It is the only user account that is given full control over the system automatically.
S-1-5-<domain>-501	Guest	A user account for people who do not have individual accounts. This user account does not require a password. By default, the Guest account is disabled.
S-1-5-<domain>-502	KRBTGT	A service account that is used by the Key Distribution Center (KDC) service.
S-1-5-<domain>-512	Domain Admins	A global group whose members are authorized to administer the domain. By default, the Domain Admins group is a member of the the Administrators group on all computers that have joined a domain, including the domain contollers. Domain Admins is the default owner of any object that is created by any member of the group.
S-1-5-<domain>-513	Domain Users	A global group that, by default, includes all user accounts in a domain. When you create a user account in a domain, it is added automatically to this group by default.
S-1-5-<domain>-514	Domain Guests	A global group that, by default, has only one member, the domain’s built-in Guest account.
S-1-5-<domain>-515	Domain Computers	A global group that includes all workstations and servers that have joined the domain.
S-1-5-<domain>-516	Domain Controllers	A global group that includes all domain controllers in the domain. New domain controllers are added automatically to the membership of this group.
S-1-5-<domain>-517	Cert Publishers	A global group that includes all computers that are running an enterprise certificate authority. Certificate Publishers are authorized to publish certificates for User objects in Active Directory.
S-1-5-<root domain>-518	Schema Admins	A universal group in native mode, a global group in mixed mode. The group is authorized to make schema changes in Active Directory. By default, the only member of the group is the Administrator account for the forest root domain.
S-1-5-<root domain>-519	Enterprise Admins	A universal group in a native-mode domain, a global group in a mixed-mode domain. The group is authorized to make forest-wide changes in Active Directory, such as adding child domains. By default, the only member of the group is the Administrator account for the forest root domain.
S-1-5-<domain>-520	Group Policy Creator Owners	A global group that is authorized to create new Group Policy objects in Active Directory. By default, the only member of the group is Administrator. The default owner of a new Group Policy object is usually the user who created it. If the user is a member of Administrators or Domain Admins, all objects that are created by the user are owned by the group. Owners have full control of the objects they own.
S-1-5-<domain>-553	RAS and IAS Servers	A domain local group. By default, this group has no members. Servers in this group have Read Account Restrictions and Read Logon Information access to User objects in Active Directory.
S-1-5-32-544	Administrators	A built-in group. After the initial installation of the operating system, the only member of the group is the Administrator account. When a computer joins a domain, the Domain Admins group is added to the Administrators group. When a server becomes a domain controller, the Enterprise Admins group also is added to the Administrators group. Members of Administrators are authorized full control over the system automatically. The group is the default owner of any object that is created by a member of the group.
S-1-5-32-545	Users	A built-in group. After the initial installation of the operating system, the only member is the Authenticated Users group. When a computer joins a domain, the Domain Users group is added to the Users group on the computer. Users can perform tasks such as running applications, using local and network printers, shutting down the computer, and locking the computer. Users can install applications that only they are allowed to use if the installation program of the application supports per-user installation.
S-1-5-32-546	Guests	A built-in group. By default, the only member is the Guest account. The Guests group allows occasional or one-time users to log on with limited privileges to a computer’s built-in Guest account.
S-1-5-32-547	Power Users	A built-in group. By default, the group has no members. Power Users can create local users and groups; modify and delete accounts that they have created; and remove users from the Power Users, Users, and Guests groups. Power Users also can install applications; create, manage, and delete local printers; and create and delete file shares.
S-1-5-32-548	Account Operators	A built-in group that exists only on domain controllers. By default, the group has no members. By default, Account Operators have permission to create, modify, and delete accounts for users, groups, and computers in all containers and organizational units (OUs) of Active Directory except the Builtin container and the Domain Controllers OU. Account Operators do not have permission to modify the Administrators and Domain Admins groups, nor do they have permission to modify the accounts for members of those groups.
S-1-5-32-549	Server Operators	A built-in group that exists only on domain controllers. By default, the group has no members. Server Operators can log on to a server interactively; create and delete network shares; start and stop services; back up and restore files; format the hard disk of the computer; and shut down the computer.
S-1-5-32-550	Print Operators	A built-in group that exists only on domain controllers. By default, the only member is the Domain Users group. Print Operators can manage printers and document queues.
S-1-5-32-551	Backup Operators	A built-in group. By default, the group has no members Backup Operators can back up and restore all files on a computer, regardless of the permissions that protect those files. Backup Operators also can log on to the computer and shut it down.
S-1-5-32-552	Replicators	[SID not used in Windows 2000.] A built-in group that is used by the File Replication service on domain controllers. By default, the group has no members. Do not add users to this group.

The following groups will show as SIDs until a Windows Server 2003 domain controller is made the primary domain controller (PDC) operations master role holder.
(The "operations master" is also known as flexible single master operations or FSMO.)
Additional new built-in groups that are created when a Windows Server 2003 domain controller is added to the domain are:

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