NtCancelTimer2
Other → NTSTATUS
NtCancelTimer2 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 38 version-and-architecture pairs recorded here it takes 11 distinct values, from 0x0043 to 0x0096.
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 (38)
| OS Version | Architecture | Number |
|---|---|---|
| Windows 10 1507 | x64 | 0x008F (143) |
| Windows 10 1507 | x86 | 0x0044 (68) |
| Windows 10 1511 | x86 | 0x0044 (68) |
| Windows 10 1511 | x64 | 0x008F (143) |
| Windows 10 1607 | x86 | 0x0044 (68) |
| Windows 10 1607 | x64 | 0x008F (143) |
| Windows 10 1703 | x64 | 0x0090 (144) |
| Windows 10 1703 | x86 | 0x0044 (68) |
| Windows 10 1709 | x64 | 0x0091 (145) |
| Windows 10 1709 | x86 | 0x0045 (69) |
| Windows 10 1803 | x64 | 0x0092 (146) |
| Windows 10 1803 | x86 | 0x0045 (69) |
| Windows 10 1809 | x64 | 0x0092 (146) |
| Windows 10 1809 | x86 | 0x0045 (69) |
| Windows 10 1903 | x64 | 0x0092 (146) |
| Windows 10 1903 | x86 | 0x0045 (69) |
| Windows 10 1909 | x64 | 0x0092 (146) |
| Windows 10 1909 | x86 | 0x0045 (69) |
| Windows 10 2004 | x64 | 0x0094 (148) |
| Windows 10 2004 | x86 | 0x0045 (69) |
| Windows 10 20H2 | x86 | 0x0045 (69) |
| Windows 10 20H2 | x64 | 0x0094 (148) |
| Windows 10 21H1 | x86 | 0x0045 (69) |
| Windows 10 21H1 | x64 | 0x0094 (148) |
| Windows 10 21H2 | x86 | 0x0045 (69) |
| Windows 10 21H2 | x64 | 0x0094 (148) |
| Windows 10 22H2 | x64 | 0x0094 (148) |
| Windows 10 22H2 | x86 | 0x0045 (69) |
| Windows 11 and Server 11 21H2 | x64 | 0x0094 (148) |
| Windows 11 and Server 11 22H2 | x64 | 0x0094 (148) |
| Windows 11 and Server 11 23H2 | x64 | 0x0094 (148) |
| Windows 11 and Server 11 24H2 | x64 | 0x0096 (150) |
| Windows 11 and Server 11 25H2 | x64 | 0x0096 (150) |
| Windows 11 and Server Server 2022 | x64 | 0x0094 (148) |
| Windows 11 and Server Server 2025 | x64 | 0x0096 (150) |
| Windows 11 and Server Server 23H2 | x64 | 0x0095 (149) |
| Windows 8 8.1 | x86 | 0x0043 (67) |
| Windows 8 8.1 | x64 | 0x008E (142) |