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# Concept - SID

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## Overview

There are several SIDs reserved for NT.

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sec

        S-1-5-21-646518322-1873620750-619646970-1110
        S for security id
        1 Revision level
        5 Identifier Authority (48 bit) 5 = logon id
        21 Sub-authority (21 = nt non unique)
        646518322        SA
        1873620750        SA domain id
        619646970        SA
        1110        user id

S-1-5-32-544 | Local admin.
S-1-1-0 | World (everybody)
S-1-5-21 | NT non-unique ids

Identifier Authorities

Identifier Authority | Abbr.
--- | ---
Null SID | S-1-0
World SID | S-1-1
Local SID | S-1-2
Creator SID | S-1-3
Non-unique | S-1-4
NT SID | S-1-5

Relative Identifiers (RIDs)

        These relative identifiers (RIDs) are used with the above identifier
        authorities to make up universal well-known SIDs.

        Note: The relative identifier (RID) refers to the portion of a SID, which
        identifies a user or group in relation to the authority that issued the SID.
        For example, the universal well-known SID Creator Owner ID (S-1-3-0) is
        made up of the identifier authority SECURITY_CREATOR_SID_AUTHORITY (3) and
        the relative identifier SECURITY_CREATOR_OWNER_RID (0).

Relative Identifiers

Relative Identifier | Code | SID
--- | --- | ---
Null | 0 | S-1-0-0
World | 0 | S-1-1-0
Local | 0 | S-1-2-0
Creator Owner | 0 | S-1-3-0
Creator Group | 1 | S-1-3-1
Creator Owner Server | 2 | S-1-3-2
Creator Group Server | 3 | S-1-3-3
Dialup | 1 | S-1-5-1
Network | 2 | S-1-5-2
Batch | 3 | S-1-5-3
Interactive | 4 | S-1-5-4
Logon Ids | 5 | S-1-5-5-X-Y
Service | 6 | S-1-5-6
Anonymous Logon | 7 | S-1-5-7
Proxy | 8 | S-1-5-8
Enterprise Controllers | 9 | S-1-5-9
Server Logon | 9 | S-1-5-9
Principal Self | 10 | S-1-5-10
Authenticated User | 11 | S-1-5-11
Restricted Code | 12 | S-1-5-12
Terminal Server | 13 | S-1-5-13
Local System | 18 | S-1-5-18
NT Non-unique | 21 | S-1-5-21
Builtin Domain | 32 | S-1-5-32

Well-known domain relative sub-authority values (RIDs).

Domain Users

Domain User | Code
--- | ---
Admin | 500
Guest | 501
Kerberos Target | 502

Domain Groups

Domain Group | Code
--- | ---
Admins | 512
Users | 513
Guests | 514
Computers | 515
Controllers | 516
Cert Admins | 517
Schema Admins | 518
Enterprise Admins | 519
Policy Admins | 520

Domain Aliases

Domain Alias | Code
--- | ---
Admins | 544
Users | 545
Guests | 546
Power Users | 547
Account Ops | 548
System Ops | 549
Print Ops | 550
Backup Ops | 551
Replicator | 552
RAS Servers | 553
Pre W2K Comp Access | 554

Universal well-known SIDs

SID | Abbr.
--- | ---
Null | S-1-0-0
World | S-1-1-0
Local | S-1-2-0
Creator Owner | S-1-3-0
Creator Group | S-1-3-1
Creator Owner Server | S-1-3-2
Creator Group Server | S-1-3-3
Non-unique IDs | S-1-4

NT well-known SIDs

SID | Abbr.
--- | ---
NT Authority | S-1-5
Dialup | S-1-5-1
Network | S-1-5-2
Batch | S-1-5-3
Interactive | S-1-5-4
Service | S-1-5-6
Anonymous Logon (Null Logon) | S-1-5-7
Proxy | S-1-5-8
Server Logon (Domain Controller) | S-1-5-9
Self | S-1-5-10
Authenticated User | S-1-5-11
Restricted Code | S-1-5-12
Terminal Server | S-1-5-13
Logon IDs | S-1-5-5-X-Y
NT Non-unique IDs | S-1-5-21-...
Built-in Domain | S-1-5-32

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