NtConvertBetweenAuxiliaryCounterAndPerformanceCounter
Other → NTSTATUS
NtConvertBetweenAuxiliaryCounterAndPerformanceCounter is a Windows NT kernel system call, in the Other category, returning NTSTATUS. Its syscall number is not the same on every Windows release: across the 30 version-and-architecture pairs recorded here it takes 10 distinct values, from 0x009D to 0x0181.
The number is an index into the system service table of one particular build, not a stable identifier, so it is not portable between Windows versions or between x64 and x86. The table below gives the value recorded for each.
Numbers across OS versions (30)
| OS Version | Architecture | Number |
|---|---|---|
| Windows 10 1703 | x64 | 0x009D (157) |
| Windows 10 1703 | x86 | 0x017D (381) |
| Windows 10 1709 | x64 | 0x009E (158) |
| Windows 10 1709 | x86 | 0x0180 (384) |
| Windows 10 1803 | x86 | 0x0180 (384) |
| Windows 10 1803 | x64 | 0x009F (159) |
| Windows 10 1809 | x64 | 0x009F (159) |
| Windows 10 1809 | x86 | 0x0180 (384) |
| Windows 10 1903 | x64 | 0x009F (159) |
| Windows 10 1903 | x86 | 0x0180 (384) |
| Windows 10 1909 | x86 | 0x0180 (384) |
| Windows 10 1909 | x64 | 0x009F (159) |
| Windows 10 2004 | x64 | 0x00A2 (162) |
| Windows 10 2004 | x86 | 0x0180 (384) |
| Windows 10 20H2 | x64 | 0x00A2 (162) |
| Windows 10 20H2 | x86 | 0x0180 (384) |
| Windows 10 21H1 | x64 | 0x00A2 (162) |
| Windows 10 21H1 | x86 | 0x0180 (384) |
| Windows 10 21H2 | x86 | 0x0181 (385) |
| Windows 10 21H2 | x64 | 0x00A2 (162) |
| Windows 10 22H2 | x86 | 0x0181 (385) |
| Windows 10 22H2 | x64 | 0x00A2 (162) |
| Windows 11 and Server 11 21H2 | x64 | 0x00A4 (164) |
| Windows 11 and Server 11 22H2 | x64 | 0x00A4 (164) |
| Windows 11 and Server 11 23H2 | x64 | 0x00A4 (164) |
| Windows 11 and Server 11 24H2 | x64 | 0x00A6 (166) |
| Windows 11 and Server 11 25H2 | x64 | 0x00A6 (166) |
| Windows 11 and Server Server 2022 | x64 | 0x00A4 (164) |
| Windows 11 and Server Server 2025 | x64 | 0x00A6 (166) |
| Windows 11 and Server Server 23H2 | x64 | 0x00A5 (165) |