NtWaitForKeyedEvent
Sync → NTSTATUS
NtWaitForKeyedEvent is a Windows NT kernel system call, in the Sync category, returning NTSTATUS. Its syscall number is not the same on every Windows release: across the 65 version-and-architecture pairs recorded here it takes 28 distinct values, from 0x000D to 0x01E5.
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 (65)
| OS Version | Architecture | Number |
|---|---|---|
| Windows 10 1507 | x64 | 0x01B5 (437) |
| Windows 10 1507 | x86 | 0x000E (14) |
| Windows 10 1511 | x86 | 0x000E (14) |
| Windows 10 1511 | x64 | 0x01B8 (440) |
| Windows 10 1607 | x64 | 0x01BE (446) |
| Windows 10 1607 | x86 | 0x000E (14) |
| Windows 10 1703 | x64 | 0x01C4 (452) |
| Windows 10 1703 | x86 | 0x000E (14) |
| Windows 10 1709 | x86 | 0x000E (14) |
| Windows 10 1709 | x64 | 0x01C8 (456) |
| Windows 10 1803 | x64 | 0x01CA (458) |
| Windows 10 1803 | x86 | 0x000E (14) |
| Windows 10 1809 | x86 | 0x000E (14) |
| Windows 10 1809 | x64 | 0x01CB (459) |
| Windows 10 1903 | x86 | 0x000E (14) |
| Windows 10 1903 | x64 | 0x01CC (460) |
| Windows 10 1909 | x86 | 0x000E (14) |
| Windows 10 1909 | x64 | 0x01CC (460) |
| Windows 10 2004 | x64 | 0x01D2 (466) |
| Windows 10 2004 | x86 | 0x000E (14) |
| Windows 10 20H2 | x86 | 0x000E (14) |
| Windows 10 20H2 | x64 | 0x01D2 (466) |
| Windows 10 21H1 | x86 | 0x000E (14) |
| Windows 10 21H1 | x64 | 0x01D2 (466) |
| Windows 10 21H2 | x86 | 0x000E (14) |
| Windows 10 21H2 | x64 | 0x01D4 (468) |
| Windows 10 22H2 | x64 | 0x01D4 (468) |
| Windows 10 22H2 | x86 | 0x000E (14) |
| Windows 11 and Server 11 21H2 | x64 | 0x01DE (478) |
| Windows 11 and Server 11 22H2 | x64 | 0x01E2 (482) |
| Windows 11 and Server 11 23H2 | x64 | 0x01E2 (482) |
| Windows 11 and Server 11 24H2 | x64 | 0x01E5 (485) |
| Windows 11 and Server 11 25H2 | x64 | 0x01E5 (485) |
| Windows 11 and Server Server 2022 | x64 | 0x01DA (474) |
| Windows 11 and Server Server 2025 | x64 | 0x01E5 (485) |
| Windows 11 and Server Server 23H2 | x64 | 0x01E4 (484) |
| Windows 7 SP0 | x64 | 0x018C (396) |
| Windows 7 SP0 | x86 | 0x0184 (388) |
| Windows 7 SP1 | x86 | 0x0184 (388) |
| Windows 7 SP1 | x64 | 0x018C (396) |
| Windows 8 8.0 | x86 | 0x000D (13) |
| Windows 8 8.0 | x64 | 0x01A8 (424) |
| Windows 8 8.1 | x64 | 0x01AD (429) |
| Windows 8 8.1 | x86 | 0x000D (13) |
| Windows Server 2003 R2 | x64 | 0x0125 (293) |
| Windows Server 2003 R2 | x86 | 0x0124 (292) |
| Windows Server 2003 R2 SP2 | x86 | 0x0124 (292) |
| Windows Server 2003 R2 SP2 | x64 | 0x0125 (293) |
| Windows Server 2003 SP0 | x86 | 0x0124 (292) |
| Windows Server 2003 SP0 | x64 | 0x0125 (293) |
| Windows Server 2003 SP1 | x86 | 0x0124 (292) |
| Windows Server 2003 SP2 | x64 | 0x0125 (293) |
| Windows Server 2003 SP2 | x86 | 0x0124 (292) |
| Windows Vista SP0 | x64 | 0x0189 (393) |
| Windows Vista SP0 | x86 | 0x016F (367) |
| Windows Vista SP1 | x86 | 0x016B (363) |
| Windows Vista SP1 | x64 | 0x0182 (386) |
| Windows Vista SP2 | x86 | 0x016B (363) |
| Windows Vista SP2 | x64 | 0x0182 (386) |
| Windows XP SP0 | x86 | 0x011A (282) |
| Windows XP SP1 | x64 | 0x0125 (293) |
| Windows XP SP1 | x86 | 0x011A (282) |
| Windows XP SP2 | x86 | 0x011A (282) |
| Windows XP SP2 | x64 | 0x0125 (293) |
| Windows XP SP3 | x86 | 0x011A (282) |