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S-1-5-11 -- Well-known SID for the Authenticated Users security group.
The string self-identifies as a SID because it starts with an S, has a revision level of 1, and an identifier authority value of 5 (NT).
S-1-5-32-549 -- Well-known SID for the built-in Server Operators security group.
The S-1-5 is as above, with a domain identifier of 32 and a predefined RID of 549.
S-1-5-21-770366253-3460018376-311458404-1005:
The S-1-5 is as above.
The domain identifier is the four-part value that follows.
RID value of 1005 specifies a particular user.
See Microsoft Knowledge Base for a list of well known SIDs.
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