SekChek’s Free Security Tools: SID Resolver

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Resolves any valid security identifier (SID) to its friendly name. E.g. S-1-5-32-544 to BUILTIN\Administrators.

If the SID is not found in your current domain, it will try to resolve the SID by searching all trusted domains.

Sid Resolver: Example

For a detailed explanation of SIDs, see SekChek’s white paper: About Security Identifiers.

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