NtSetTimerEx
Set → NTSTATUS
NtSetTimerEx is a Windows NT kernel system call, in the Set category, returning NTSTATUS. Its syscall number is not the same on every Windows release: across the 44 version-and-architecture pairs recorded here it takes 23 distinct values, from 0x0033 to 0x01C1.
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 (44)
| OS Version | Architecture | Number |
|---|---|---|
| Windows 10 1507 | x64 | 0x0193 (403) |
| Windows 10 1507 | x86 | 0x0035 (53) |
| Windows 10 1511 | x86 | 0x0035 (53) |
| Windows 10 1511 | x64 | 0x0196 (406) |
| Windows 10 1607 | x86 | 0x0035 (53) |
| Windows 10 1607 | x64 | 0x019C (412) |
| Windows 10 1703 | x86 | 0x0035 (53) |
| Windows 10 1703 | x64 | 0x01A2 (418) |
| Windows 10 1709 | x86 | 0x0036 (54) |
| Windows 10 1709 | x64 | 0x01A5 (421) |
| Windows 10 1803 | x64 | 0x01A7 (423) |
| Windows 10 1803 | x86 | 0x0036 (54) |
| Windows 10 1809 | x86 | 0x0036 (54) |
| Windows 10 1809 | x64 | 0x01A8 (424) |
| Windows 10 1903 | x86 | 0x0036 (54) |
| Windows 10 1903 | x64 | 0x01A9 (425) |
| Windows 10 1909 | x86 | 0x0036 (54) |
| Windows 10 1909 | x64 | 0x01A9 (425) |
| Windows 10 2004 | x86 | 0x0036 (54) |
| Windows 10 2004 | x64 | 0x01AF (431) |
| Windows 10 20H2 | x64 | 0x01AF (431) |
| Windows 10 20H2 | x86 | 0x0036 (54) |
| Windows 10 21H1 | x64 | 0x01AF (431) |
| Windows 10 21H1 | x86 | 0x0036 (54) |
| Windows 10 21H2 | x86 | 0x0036 (54) |
| Windows 10 21H2 | x64 | 0x01B1 (433) |
| Windows 10 22H2 | x86 | 0x0036 (54) |
| Windows 10 22H2 | x64 | 0x01B1 (433) |
| Windows 11 and Server 11 21H2 | x64 | 0x01BA (442) |
| Windows 11 and Server 11 22H2 | x64 | 0x01BE (446) |
| Windows 11 and Server 11 23H2 | x64 | 0x01BE (446) |
| Windows 11 and Server 11 24H2 | x64 | 0x01C1 (449) |
| Windows 11 and Server 11 25H2 | x64 | 0x01C1 (449) |
| Windows 11 and Server Server 2022 | x64 | 0x01B7 (439) |
| Windows 11 and Server Server 2025 | x64 | 0x01C1 (449) |
| Windows 11 and Server Server 23H2 | x64 | 0x01C0 (448) |
| Windows 7 SP0 | x64 | 0x0170 (368) |
| Windows 7 SP0 | x86 | 0x0163 (355) |
| Windows 7 SP1 | x86 | 0x0163 (355) |
| Windows 7 SP1 | x64 | 0x0170 (368) |
| Windows 8 8.0 | x64 | 0x0187 (391) |
| Windows 8 8.0 | x86 | 0x0033 (51) |
| Windows 8 8.1 | x64 | 0x018B (395) |
| Windows 8 8.1 | x86 | 0x0034 (52) |